LabID-base/OpenAlex-Afillation huggingface dataset:
The PARP inhibitor/immunotherapy paradox in advanced ovarian cancer: positive endpoints, perplexing interpretations
Year: 2025
Type: editorial
Language: en
Topic: PARP inhibition in cancer therapy
Authors and affiliations:
raw_author_name: J.A. Ledermann
raw_affiliation_strings: UCL Cancer Institute, University College London, London, UK. Electronic address: j.ledermann@ucl.ac.uk
UCL Cancer Institute, University College London, 72, Huntley Street, London WC1E 6DD, United Kingdom. Electronic address: j.ledermann@ucl.ac.uk
raw_author_name: R.L. Coleman
raw_affiliation_strings: Gynecologic Oncology, Texas Oncology, US Oncology Network, Shenandoah; GOG Foundation, Philadelphia, USA
Gynecologic Oncology, Texas Oncology, US Oncology Network, Vice-President, GOG Foundation, Shenandoah, TX 77380, 520 River Chase Blvd, Georgetown, TX 78628. Electronic address: rcoleman@gog.org
Influence of Fe content on microstructure and mechanical properties of Cu-Fe alloys processed by friction stir processing
Year: 2025
Type: article
Language: en
Topic: Advanced Welding Techniques Analysis
Authors and affiliations:
raw_author_name: Yu Wang
raw_affiliation_strings: State Key Lab for Powder Metallurgy, Central South University, Changsha 410083, PR China
raw_author_name: Yidi Li
raw_affiliation_strings: State Key Lab for Powder Metallurgy, Central South University, Changsha 410083, PR China
raw_author_name: Hui Wang
raw_affiliation_strings: State Key Lab for Powder Metallurgy, Central South University, Changsha 410083, PR China
raw_author_name: Yunping Li
raw_affiliation_strings: State Key Lab for Powder Metallurgy, Central South University, Changsha 410083, PR China
Co-Oximetry and Pulse Oximetry—Impact on Qualifying for Long-Term Oxygen Therapy
Year: 2025
Type: article
Language: en
Topic: Non-Invasive Vital Sign Monitoring
Authors and affiliations:
raw_author_name: François Lellouche
raw_affiliation_strings: Drs. Lellouche and Maltais are affiliated with Institut Universitaire de Cardiologie et de Pneumologie de Québec, Université Laval, Quebec City, Quebec, Canada
raw_author_name: François Maltais
raw_affiliation_strings: Drs. Lellouche and Maltais are affiliated with Institut Universitaire de Cardiologie et de Pneumologie de Québec, Université Laval, Quebec City, Quebec, Canada
Brain health in youth - what are we measuring? – A comprehensive review
Year: 2025
Type: review
Language: en
Topic: Health, Environment, Cognitive Aging
Authors and affiliations:
raw_author_name: Susanne R. De Rooij
raw_affiliation_strings: Amsterdam UMC location University of Amsterdam, Department of Epidemiology and Data Science, Meibergdreef 9, Amsterdam, the Netherlands; Amsterdam Public Health, Aging and Later Life, Health Behaviors and Chronic Diseases, Amsterdam, the Netherlands; Amsterdam Reproduction and Development, Amsterdam, the Netherlands. Electronic address: s.r.derooij@amsterdamumc.nl
raw_author_name: Amber Boots
raw_affiliation_strings: Amsterdam UMC location University of Amsterdam, Department of Epidemiology and Data Science, Meibergdreef 9, Amsterdam, the Netherlands; Amsterdam Public Health, Aging and Later Life, Health Behaviors and Chronic Diseases, Amsterdam, the Netherlands; Amsterdam Reproduction and Development, Amsterdam, the Netherlands
<i>Response to Letter:</i> From Sting to Skin Disorder: Lichen Planus-like Eruption Following Jellyfish Envenomation
Year: 2025
Type: letter
Language: en
Topic: Marine Invertebrate Physiology and Ecology
Authors and affiliations:
raw_author_name: Mouna Korbi
raw_affiliation_strings: Dermatology Department, Fattouma Bourguiba University Hospital, University of Monastir, Monastir, Tunisia
raw_author_name: Radhia Haj Salem
raw_affiliation_strings: Pediatric Department, Fattouma Bourguiba University Hospital, University of Monastir, Monastir, Tunisia
raw_author_name: Sriha Badreddine
raw_affiliation_strings: Anatomopathology Department, Farhat Hached University Hospital, University of Sousse, Sousse, Tunisia
raw_author_name: Belhadjali Hichem
raw_affiliation_strings: Dermatology Department, Fattouma Bourguiba University Hospital, University of Monastir, Monastir, Tunisia
raw_author_name: Monia Youssef
raw_affiliation_strings: Dermatology Department, Fattouma Bourguiba University Hospital, University of Monastir, Monastir, Tunisia
raw_author_name: Jameleddine Zili
raw_affiliation_strings: Dermatology Department, Fattouma Bourguiba University Hospital, University of Monastir, Monastir, Tunisia
Enhancing multi-level contrastive clustering via attentive fusion
Year: 2025
Type: article
Language: en
Topic: Domain Adaptation and Few-Shot Learning
Authors and affiliations:
raw_author_name: Wei Liang
raw_affiliation_strings: School of Software Engineering, South China University of Technology, 510006, Guangzhou, Guangdong, China
raw_author_name: Kai Chen
raw_affiliation_strings: School of Software Engineering, South China University of Technology, 510006, Guangzhou, Guangdong, China
raw_author_name: Dong Li
raw_affiliation_strings: School of Software Engineering, South China University of Technology, 510006, Guangzhou, Guangdong, China
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, 510006, Guangzhou, Guangdong, China
raw_author_name: Xueru Fang
raw_affiliation_strings: School of Software Engineering, South China University of Technology, 510006, Guangzhou, Guangdong, China
raw_author_name: Chuanpeng Wang
raw_affiliation_strings: School of Software Engineering, South China University of Technology, 510006, Guangzhou, Guangdong, China
Deciphering tribological divergence of carbon-based coatings under extreme-temperature dry machining of aluminum alloys
Year: 2025
Type: article
Language: en
Topic: Diamond and Carbon-based Materials Research
Authors and affiliations:
raw_author_name: Jingwen Wang
raw_affiliation_strings: College of Mechanical Engineering, Yanshan University, Qinhuangdao, 066004, China
raw_author_name: Shihao Zhou
raw_affiliation_strings: College of Mechanical Engineering, Yanshan University, Qinhuangdao, 066004, China
raw_author_name: Jiaxin Zhang
raw_affiliation_strings: College of Mechanical Engineering, Yanshan University, Qinhuangdao, 066004, China
raw_author_name: Qingxiang Yang
raw_affiliation_strings: State Key Laboratory of Metastable Materials Science & Technology, Yanshan University, Qinhuangdao, 066004, China
raw_author_name: Yuchen Xiao
raw_affiliation_strings: CITIC Dicastal Co., Ltd., Qinhuangdao, 066000, China
raw_author_name: Xiwei Xue
raw_affiliation_strings: CITIC Dicastal Co., Ltd., Qinhuangdao, 066000, China
raw_author_name: Yanming He
raw_affiliation_strings: CITIC Dicastal Co., Ltd., Qinhuangdao, 066000, China
raw_author_name: Xiaolei Xing
raw_affiliation_strings: College of Mechanical Engineering, Yanshan University, Qinhuangdao, 066004, China
State Key Laboratory of Metastable Materials Science & Technology, Yanshan University, Qinhuangdao, 066004, China
raw_author_name: Yefei Zhou
raw_affiliation_strings: College of Mechanical Engineering, Yanshan University, Qinhuangdao, 066004, China
State Key Laboratory of Metastable Materials Science & Technology, Yanshan University, Qinhuangdao, 066004, China
Development of high-performance Zn-Bi alloy anodes: Electrochemical stability and corrosion mitigation in alkaline battery applications
Year: 2025
Type: article
Language: en
Topic: Advanced battery technologies research
Authors and affiliations:
raw_author_name: Abdelrahman Elsayed
raw_affiliation_strings: Chemistry Department, Faculty of Science, Sohag University, Sohag 82524, Egypt
raw_author_name: Mostafa Adel
raw_affiliation_strings: Chemistry Department, Faculty of Science, Sohag University, Sohag 82524, Egypt
raw_author_name: Mahmoud Elrouby
raw_affiliation_strings: Chemistry Department, Faculty of Science, Sohag University, Sohag 82524, Egypt
Faculty of Science, Sohag National University, Sohag 82511, Egypt
Dynamic flavor mapping to breast milk in infant formula: From volatile biomarkers to synthetic biology-driven flavor optimization
Year: 2025
Type: article
Language: en
Topic: Microencapsulation and Drying Processes
Authors and affiliations:
raw_author_name: Mengyuan Yang
raw_affiliation_strings: Key Laboratory of Geriatric Nutrition and Health, Ministry of Education, Beijing Technology & Business University, Beijing, 100048, China
raw_author_name: Jianfeng Wang
raw_affiliation_strings: Key Laboratory of Geriatric Nutrition and Health, Ministry of Education, Beijing Technology & Business University, Beijing, 100048, China
raw_author_name: Yufang Su
raw_affiliation_strings: Key Laboratory of Geriatric Nutrition and Health, Ministry of Education, Beijing Technology & Business University, Beijing, 100048, China
raw_author_name: Baoguo Sun
raw_affiliation_strings: Key Laboratory of Geriatric Nutrition and Health, Ministry of Education, Beijing Technology & Business University, Beijing, 100048, China
raw_author_name: Nasi Ai
raw_affiliation_strings: Key Laboratory of Geriatric Nutrition and Health, Ministry of Education, Beijing Technology & Business University, Beijing, 100048, China
Admittance spectroscopy of 2–5 nm detonation diamonds in NaCl-nanodiamond mixture. Electronic properties of small nanodiamonds
Year: 2025
Type: article
Language: en
Topic: Diamond and Carbon-based Materials Research
Authors and affiliations:
raw_author_name: S.G. Buga
raw_affiliation_strings: Moscow Center for Advanced Studies, 107031, Moscow, Russia
Research Center "Kurchatov Institute"-TISNUM, Moscow, Russia
raw_author_name: M.Yu. Popov
raw_affiliation_strings: Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia
raw_author_name: D.A. Ovsyannikov
raw_affiliation_strings: Research Center "Kurchatov Institute"-TISNUM, Moscow, Russia
raw_author_name: V.S. Baidyshev
raw_affiliation_strings: Skolkovo Institute of Science and Technology, Moscow, Russia
raw_author_name: A.G. Kvashnin
raw_affiliation_strings: Skolkovo Institute of Science and Technology, Moscow, Russia
Multiple EEG channel attention based multi-task model for epileptiform activity quantification
Year: 2025
Type: article
Language: en
Topic: EEG and Brain-Computer Interfaces
Authors and affiliations:
raw_author_name: Dinghan Hu
raw_affiliation_strings: Machine Learning and I-Health International Cooperation Base of Zhejiang Province, Hangzhou Dianzi University, Hangzhou, 310018, China
School of Automation, Hangzhou Dianzi University, Zhejiang, 310018, China
raw_author_name: Zirun Jiang
raw_affiliation_strings: Machine Learning and I-Health International Cooperation Base of Zhejiang Province, Hangzhou Dianzi University, Hangzhou, 310018, China
School of Automation, Hangzhou Dianzi University, Zhejiang, 310018, China
raw_author_name: Chenzhi Jin
raw_affiliation_strings: Machine Learning and I-Health International Cooperation Base of Zhejiang Province, Hangzhou Dianzi University, Hangzhou, 310018, China
School of Automation, Hangzhou Dianzi University, Zhejiang, 310018, China
raw_author_name: Zuonian Xie
raw_affiliation_strings: Zhejiang Jingxin Pharmaceutical Co., Ltd., Xinchang County, Shaoxing, 312500, China
raw_author_name: Feng Gao
raw_affiliation_strings: Department of Neurology, Children’s Hospital, Zhejiang University School of Medicine, National Clinical Research Center for Child Health, Hangzhou, 310018, China
raw_author_name: Jiuwen Cao
raw_affiliation_strings: Machine Learning and I-Health International Cooperation Base of Zhejiang Province, Hangzhou Dianzi University, Hangzhou, 310018, China
School of Automation, Hangzhou Dianzi University, Zhejiang, 310018, China
Oxygen isotope-based evidence for stepwise climate cooling aligns with the tripartite division of the Ordovician
Year: 2025
Type: article
Language: en
Topic: Paleontology and Stratigraphy of Fossils
Authors and affiliations:
raw_author_name: Zhutong Zhang
raw_affiliation_strings: College of Earth and Planetary Science, University of Chinese Academy of Sciences, Beijing 100049, China
State Key Laboratory of Lithospheric and Environmental Coevolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
raw_author_name: Rongchang Wu
raw_affiliation_strings: State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China
raw_author_name: Oliver Lehnert
raw_affiliation_strings: GeoZentrum Nordbayern, Research Group Sedimentology, Geothermal Energy and Palaeoclimate, Friedrich-Alexander-Universität Erlangen-Nürnberg, Schlossgarten 5, D-91054 Erlangen, Germany
raw_author_name: Mikael Calner
raw_affiliation_strings: Department of Earth and Environmental Sciences, Lund University, Sölvegatan 12, SE-223 62 Lund, Sweden
raw_author_name: Christian M.Ø. Rasmussen
raw_affiliation_strings: Department of Geosciences and Natural Resource Management, University of Copenhagen, Øster Voldgade 10, DK-1350 Copenhagen, Denmark
Globe Institute, University of Copenhagen, Øster Voldgade 5–7, 1350 Copenhagen, Denmark
raw_author_name: Guo-Qiang Tang
raw_affiliation_strings: State Key Laboratory of Lithospheric and Environmental Coevolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
raw_author_name: Xian-Hua Li
raw_affiliation_strings: College of Earth and Planetary Science, University of Chinese Academy of Sciences, Beijing 100049, China
State Key Laboratory of Lithospheric and Environmental Coevolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
Emerging insights into traditional Chinese medicine interventions for chemotherapy-induced cardiotoxicity
Year: 2025
Type: review
Language: en
Topic: Chemotherapy-induced cardiotoxicity and mitigation
Authors and affiliations:
raw_author_name: Jun Li
raw_affiliation_strings: Key Laboratory of Shaanxi Administration of Traditional Chinese Medicine for TCM Compatibility, Shaanxi University of Chinese Medicine, Xi'an, 712046, China; Wuxi Institute of Chinese and Western Integrative Medicine, and Wuxi Cancer Institute, Affiliated Hospital of Jiangnan University, Wuxi, 214062, China. Electronic address: acdflj@163.com
raw_author_name: Zhen Zhang
raw_affiliation_strings: Department of Integrative Oncology, Affiliated Hospital of Jiangnan University, Wuxi, 214062, Jiangsu Province, China. Electronic address: zz_doctor1988@163.com
Department of Integrative Oncology, Affiliated Hospital of Jiangnan University, Wuxi 214062, Jiangsu Province, China. Electronic address: zz_doctor1988@163.com
raw_author_name: Dingqiao Xu
raw_affiliation_strings: Key Laboratory of Shaanxi Administration of Traditional Chinese Medicine for TCM Compatibility, Shaanxi University of Chinese Medicine, Xi'an, 712046, China. Electronic address: xudingqiao16@126.com
raw_author_name: Ruijia Fu
raw_affiliation_strings: Key Laboratory of Shaanxi Administration of Traditional Chinese Medicine for TCM Compatibility, Shaanxi University of Chinese Medicine, Xi'an, 712046, China. Electronic address: frjde@sina.com
raw_author_name: Zhicheng Gong
raw_affiliation_strings: Wuxi Institute of Chinese and Western Integrative Medicine, and Wuxi Cancer Institute, Affiliated Hospital of Jiangnan University, Wuxi, 214062, China. Electronic address: jichan@jiangnan.edu.cn
raw_author_name: Yuping Tang
raw_affiliation_strings: Key Laboratory of Shaanxi Administration of Traditional Chinese Medicine for TCM Compatibility, Shaanxi University of Chinese Medicine, Xi'an, 712046, China. Electronic address: yupingtang@sntcm.edu.cn
raw_author_name: Yanyan Chen
raw_affiliation_strings: Key Laboratory of Shaanxi Administration of Traditional Chinese Medicine for TCM Compatibility, Shaanxi University of Chinese Medicine, Xi'an, 712046, China; Wuxi Institute of Chinese and Western Integrative Medicine, and Wuxi Cancer Institute, Affiliated Hospital of Jiangnan University, Wuxi, 214062, China. Electronic address: chenyanyan59@163.com
Improving the deferred acceptance with minimal compromise
Year: 2025
Type: article
Language: en
Topic: Game Theory and Voting Systems
Authors and affiliations:
raw_author_name: Mustafa Oǧuz Afacan
raw_affiliation_strings: Mohamed bin Zayed University of Artificial Intelligence, Abu Dhabi, UAE
raw_author_name: Umut Dur
raw_affiliation_strings: Department of Economics, NC State University, Raleigh, NC, USA
raw_author_name: A. Arda Gitmez
raw_affiliation_strings: Department of Economics, Bilkent University, Ankara, Turkey
raw_author_name: Özgür Yılmaz
raw_affiliation_strings: Department of Economics, Koç University, Istanbul, Turkey
Classification of kiwifruit storage day based on hyperspectral imaging and convolutional neural networks
Year: 2025
Type: article
Language: en
Topic: Spectroscopy and Chemometric Analyses
Authors and affiliations:
raw_author_name: Yongxian Wang
raw_affiliation_strings: College of Mechanical and Electrical Engineering, Shandong Agricultural University, Taian, China
raw_author_name: Junsheng Liu
raw_affiliation_strings: College of Mechanical and Electrical Engineering, Shandong Agricultural University, Taian, China
raw_author_name: Kaisen Zhang
raw_affiliation_strings: College of Mechanical and Electrical Engineering, Shandong Agricultural University, Taian, China
raw_author_name: Yi Liu
raw_affiliation_strings: College of Mechanical and Electrical Engineering, Shandong Agricultural University, Taian, China
Shandong Key Laboratory of Intelligent Production Technology and Equipment for Facility Horticulture, China
raw_author_name: Ruofei Liu
raw_affiliation_strings: College of Mechanical and Electrical Engineering, Shandong Agricultural University, Taian, China
raw_author_name: Bo Ma
raw_affiliation_strings: College of Mechanical and Electrical Engineering, Shandong Agricultural University, Taian, China
Shandong Key Laboratory of Intelligent Production Technology and Equipment for Facility Horticulture, China
raw_author_name: Linlong Jing
raw_affiliation_strings: College of Mechanical and Electrical Engineering, Shandong Agricultural University, Taian, China
Shandong Key Laboratory of Intelligent Production Technology and Equipment for Facility Horticulture, China
raw_author_name: Xinpeng Cao
raw_affiliation_strings: College of Mechanical and Electrical Engineering, Shandong Agricultural University, Taian, China
raw_author_name: Hongjian Zhang
raw_affiliation_strings: College of Mechanical and Electrical Engineering, Shandong Agricultural University, Taian, China
Shandong Engineering Research Center of Agricultural Equipment Intelligentization, Taian, China
Shandong Key Laboratory of Intelligent Production Technology and Equipment for Facility Horticulture, China
raw_author_name: Linlin Sun
raw_affiliation_strings: College of Mechanical and Electrical Engineering, Shandong Agricultural University, Taian, China
Shandong Key Laboratory of Intelligent Production Technology and Equipment for Facility Horticulture, China
raw_author_name: Jinxing Wang
raw_affiliation_strings: College of Mechanical and Electrical Engineering, Shandong Agricultural University, Taian, China
Shandong Engineering Research Center of Agricultural Equipment Intelligentization, Taian, China
Shandong Key Laboratory of Intelligent Production Technology and Equipment for Facility Horticulture, China
Long-term MACE and bleeding risk prediction using 4-item PRECISE-DAPT vs. DAPT scores in PCI patients with achieved LDL-C &lt; 70 mg/dL
Year: 2025
Type: article
Language: en
Topic: Lipoproteins and Cardiovascular Health
Authors and affiliations:
raw_author_name: Ji Yoon Kim
raw_affiliation_strings: Department of Cardiology, Daegu Catholic University Medical Center, Daegu, Republic of Korea
raw_author_name: Hae Won Jung
raw_affiliation_strings: Department of Cardiology, Daegu Catholic University Medical Center, Daegu, Republic of Korea. Electronic address: pcijung@cu.ac.kr
Department of Cardiology, Daegu Catholic University Medical Center, Daegu, Republic of Korea. Electronic address: fdssgjj@naver.com
Insulin-activated β-cell-liver axis protects against acetaminophen-induced acute liver injury by suppressing oxidative stress and purine catabolism
Year: 2025
Type: article
Language: en
Topic: Drug-Induced Hepatotoxicity and Protection
Authors and affiliations:
raw_author_name: Yan Zhang
raw_affiliation_strings: Department of Clinical Laboratory, Children's Hospital of Nanjing Medical University, Nanjing, China
raw_author_name: Kerong Liu
raw_affiliation_strings: Department of Endocrinology, Affiliated Children's Hospital of Jiangnan University, Wuxi Children's Hospital, Wuxi, China
raw_author_name: Ting Fu
raw_affiliation_strings: Department of Clinical Laboratory, Children's Hospital of Nanjing Medical University, Nanjing, China
raw_author_name: Yuexin Zhang
raw_affiliation_strings: Department of Clinical Laboratory, Children's Hospital of Nanjing Medical University, Nanjing, China
raw_author_name: Bin Xue
raw_affiliation_strings: Department of Nephrology, State Key Laboratory of Reproductive Medicine, Children's Hospital of Nanjing Medical University, Nanjing, China; Jiangsu Key Laboratory of Early Development and Chronic Diseases Prevention in Children, Nanjing Medical University, Nanjing, China
raw_author_name: Meng Wu
raw_affiliation_strings: Department of Clinical Laboratory, Children's Hospital of Nanjing Medical University, Nanjing, China. Electronic address: jywumeng1989@njmu.edu.cn
raw_author_name: Daheng Yang
raw_affiliation_strings: Department of Clinical Laboratory, Children's Hospital of Nanjing Medical University, Nanjing, China. Electronic address: yangdaheng@njmu.edu.cn
raw_author_name: Hongbing Chen
raw_affiliation_strings: Department of Clinical Laboratory, Children's Hospital of Nanjing Medical University, Nanjing, China. Electronic address: chenghb1999@126.com
Design and analysis of a self-interference-free QR decomposition-based GFDM system under generalized <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si5.svg" display="inline" id="d1e488"> <mml:mrow> <mml:mi>α</mml:mi> <mml:mtext>–</mml:mtext> <mml:mi>η</mml:mi> <mml:mtext>–</mml:mtext> <mml:mi>κ</mml:mi> <mml:mtext>–</mml:mtext> <mml:mi>μ</mml:mi> </mml:mrow> </mml:math> fading channels for next-generation wireless applications
Year: 2025
Type: article
Language: en
Topic: PAPR reduction in OFDM
Authors and affiliations:
raw_author_name: Naga Siva Prasad Bodempudi
raw_affiliation_strings: Department of Electronics and Communication Engineering, National Institute of Technology Karnataka Surathkal, Mangaluru, 575025, Karnataka, India
raw_author_name: Ashvini Chaturvedi
raw_affiliation_strings: Department of Electronics and Communication Engineering, National Institute of Technology Karnataka Surathkal, Mangaluru, 575025, Karnataka, India
raw_author_name: Rashmi H.
raw_affiliation_strings: Department of Electronics and Communication Engineering, National Institute of Technology Karnataka Surathkal, Mangaluru, 575025, Karnataka, India
raw_author_name: Muralidhar Kulkarni
raw_affiliation_strings: Department of Electronics and Communication Engineering, National Institute of Technology Karnataka Surathkal, Mangaluru, 575025, Karnataka, India
Semi-seg: Semi-supervised learning framework for image segmentation
Year: 2025
Type: article
Language: en
Topic: Advanced Neural Network Applications
Authors and affiliations:
raw_author_name: Adrián Inés
raw_affiliation_strings: University of La Rioja, Department of Mathematics and Computer Science, Logroño Spain
raw_author_name: Jónathan Heras
raw_affiliation_strings: University of La Rioja, Department of Mathematics and Computer Science, Logroño Spain