update citation

README.md

@@ -17,6 +17,8 @@ This model is released under the [Creative Commons 4.0 International License](ht
 
 #### Reference
 
+Ja:
+
 ```
 @InProceedings{sugimoto_nlp2023_jmedroberta,
     author =    "杉本海人 and 壹岐太一 and 知田悠生 and 金沢輝一 and 相澤彰子",
@@ -27,6 +29,18 @@ This model is released under the [Creative Commons 4.0 International License](ht
 }
 ```
 
+En:
+
+```
+@InProceedings{sugimoto_nlp2023_jmedroberta,
+    author =    "Sugimoto, Kaito and Iki, Taichi and Chida, Yuki and Kanazawa, Teruhito and Aizawa, Akiko",
+    title =     "J{M}ed{R}o{BERT}a: a Japanese Pre-trained Language Model on Academic Articles in Medical Sciences (in Japanese)",
+    booktitle = "Proceedings of the 29th Annual Meeting of the Association for Natural Language Processing",
+    year =      "2023",
+    url =       "https://www.anlp.jp/proceedings/annual_meeting/2023/pdf_dir/P3-1.pdf"
+}
+```
+
 ## Datasets used for pre-training
 
 - abstracts (train: 1.6GB (10M sentences), validation: 0.2GB (1.3M sentences))