Update constants.py

constants.py

@@ -17,10 +17,10 @@ particularly in terms of language understanding and reasoning.
 
 """
 
-CITATION_TEXT = """@article{,
+CITATION_TEXT = """@article{myrzakhan2024openllmleaderboard,
   title={Open-LLM-Leaderboard: From Multi-choice to Open-style Questions for LLMs Evaluation, Benchmark, and Arena},
   author={Aidar Myrzakhan, Sondos Mahmoud Bsharat, Zhiqiang Shen},
-  journal={arXiv preprint },
+  journal={arXiv preprint arXiv:2406.07545},
   year={2024},
 }
 """