Update README.md

Updated the paper info, including DOI.

README.md

@@ -49,5 +49,6 @@ The dataset contains 3 components:
 
 The dataset was created semi-automatically, utilizing questions available from PubMedQA dataset.
 
-# arXiv paper
-https://arxiv.org/abs/2407.05015
+# Paper
+Bojana Bašaragin, Adela Ljajić, Darija Medvecki, Lorenzo Cassano, Miloš Košprdić, and Nikola Milošević. 2024. How do you know that? Teaching Generative Language Models to Reference Answers to Biomedical Questions. In Proceedings of the 23rd Workshop on Biomedical Natural Language Processing, pages 536–547, Bangkok, Thailand. Association for Computational Linguistics, DOI: 10.18653/v1/2024.bionlp-1.44.
+Link: https://aclanthology.org/2024.bionlp-1.44