Update README.md

README.md

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 # Introduction
 
-Eurus-70B-NCA is NCA fine-tuned from Eurus-70B-SFT on all multi-turn trajectory pairs in UltraInteract and all pairs in UltraFeedback.
+Eurus-70B-NCA is [NCA](https://arxiv.org/abs/2402.05369) fine-tuned from Eurus-70B-SFT on all multi-turn trajectory pairs in UltraInteract and all pairs in UltraFeedback.
 
 It achieves the best overall performance among open-source models of similar sizes and even outperforms specialized models in corresponding domains in many cases. Notably, EURUS-70B-NCA achieves better performance than GPT-3.5 Turbo through a comprehensive benchmarking across 12 tests covering five tasks.