Pattern phase transitions of self-propelled particles: gases, crystals, liquids, and mills

- Cheng, Zhao, Chen, Zhiyong, Vicsek, Tamás, Chen, Duxin, Zhang, Hai-Tao

Two-level leader-follower organization in pigeon flocks

- Chen, Zhiyong, Zhang, Hai-Tao, Chen, Xi, Chen, Duxin, Zhou, Tao