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README.md

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 license: mit
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+## References
+For more information, please refer to our paper and GitHub repository.
+
+Paper: [Two Stones Hit One Bird: Bilevel Positional Encoding for Better Length Extrapolation](https://arxiv.org/abs/2401.16421)
+
+GitHub: [BiPE](https://github.com/zhenyuhe00/BiPE)
+
+Authors: *Zhenyu He\*, Guhao Feng\*, Shengjie Luo\*, Kai Yang, Di He, Jingjing Xu, Zhi Zhang, Hongxia Yang, Liwei Wang*