Highly cooperative individuals’ clustering property in myopic strategy groups Xiaoyu Li, Le Cheng, Xiaotong Niu, Siying Li, Chen Liu and Peican Zhu Eur. Phys. J. B, 94 6 (2021) 126 Published online: 18 June 2021 DOI: 10.1140/epjb/s10051-021-00136-5