Update README.md

README.md

@@ -32,9 +32,9 @@ We hope these tools will prove to be useful for the community. Please follow alo
 References
 
 <ol>
-<li> An Image is Worth 16x16 Words: Transformers for Image Recognition at Scale: https://arxiv.org/abs/2010.11929 </li>
-<li> DeiT: https://arxiv.org/abs/2012.12877 </li>
-<li> DINO: https://arxiv.org/abs/2104.14294 </li>
+<li> [1] An Image is Worth 16x16 Words: Transformers for Image Recognition at Scale: https://arxiv.org/abs/2010.11929 </li>
+<li> [2] DeiT: https://arxiv.org/abs/2012.12877 </li>
+<li> [3] DINO: https://arxiv.org/abs/2104.14294 </li>
 </ol>
 
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