## 4 Quantitative Analysis of Related Literature on Product R&D Management
### Research Citation Analysis Based on Histcite
#### 4.1.2 Nearly 10 Years from 2011 to 2020  
Compared to the citation analysis mapping in Figure 4 for the years before 2011, it is evident that the research of the past ten years has not formed a systematic mutual citation relationship, which is closely related to the new characteristics of product R&D management in recent years and the increasing diversification of product R&D management methods. Due to the increasing number of problems to be solved and the increasing diversity of research scenarios, scholars' research has also shown different clustering distributions. Moreover, considering the reasons of time, many theories were still under development, and, when proposing new concepts and viewpoints, the referenced documents were often traced back to the early stages of the research, starting from the original phenomenon to explore the essence of the new problem. Therefore, most of the citations are still relatively early and authoritative documents, and thus the citation network is not systematic enough. According to the citation analysis in the past ten years, shown in Figure 5, we can identify the current topics of interest in the academic world and research progress based on the selected LCS top 30 documents. * Sustainable development. As the industry's green transformation has become a general trend, integrating green concepts into the product development process to continuously provide society with green products and solutions is one topic that scholars have been paying attention to over the last decade. [PERSON] and [PERSON] pointed out that green innovation is a critical factor in achieving a win-win situation between the environment and the economy, and achieving green product innovation and development through supplier participation is a strategy that enterprises should give priority to [39]. Through the analysis of eight cases, [PERSON] et al. pointed out that the greenness of products played a pivotal role in realizing the green transformation of the industry [40]. Through empirical research on the determinants of green product R&D performance, [PERSON] and [PERSON] found that green dynamic capabilities, green transformation leadership, and green creativity could significantly improve product R&D performance [41]. Subsequently, [PERSON] and [PERSON] built a new product development framework for sustainable development based on the life cycle theory and proposed to support the cooperation among them by reducing complexity, coordinating processes and technologies [42]. For integrated product development that considers environmental factors, [PERSON] et al. conducted interviews with a sample of Swedish manufacturing companies and found that they still needed to consider the system integration of environmental requirements in product development decisions [43]. In the second year, [PERSON] et al. inspected the green product R&D and performance of Brazilian companies and studied the acceptance of green product R&D (GPD) by technology and organizations. The authors proved that the degree of technology adoption can effectively promote GPD, but that the degree of organizational adoption was affected by uncertainty, and management needed to control the uncertainty to enhance the effect of organizational adoption of GPD [44]. * Pay attention to consumers. Compared with previous studies, scholars are primarily concerned with the impact of supplier participation on product development. In the Web2.0 era, with consumer identity transformation, consumer participation began  
Figure 5: Citation map of the top 30 documents ranked by LCS from 2011 to 2020.  
to play an essential role in the value chain. Scholars also paid attention to this point and carried out research on the subject. [PERSON] and [PERSON] looked at the gradual evolution of product research and the development of market-oriented logic, and found that the relationship between these changes and consumer purchase decisions did not receive attention.