Update README.md

README.md

@@ -44,11 +44,12 @@ each annotated with 30 control values that can be applied to the physical robot
 
 **BibTeX:**
 
-[More Information Needed]
-
-**APA:**
-
-[More Information Needed]
+@article{li2025x2c,
+  title={X2C: A Dataset Featuring Nuanced Facial Expressions for Realistic Humanoid Imitation},
+  author={Li, Peizhen and Cao, Longbing and Wu, Xiao-Ming and Yang, Runze and Yu, Xiaohan},
+  journal={arXiv preprint arXiv:2505.11146},
+  year={2025}
+}
 
 
 ## Dataset Card Authors