Update app.py

app.py

@@ -419,7 +419,7 @@ with gr.Blocks(title="LLM Training Estimator — Chinchilla Scaling Law") as dem
     📚 References:  
     - [Chinchilla](https://arxiv.org/abs/2203.15556): *Training Compute-Optimal Large Language Models*  
     - [GPT-3](https://arxiv.org/abs/2005.14165) (note: arXiv:2001.08361 is earlier version)  
-    - [MFU definition](https://arxiv.org/abs/2205.14451)
+    - [MFU definition](https://arxiv.org/abs/2104.04473)
     - [Muon](https://arxiv.org/abs/2502.16982)
     """)