Cliophysics: A scientific analysis of recurrent historical events Yuji Aruka, Belal Baaquie, Xiaosong Chen, Zengru Di, Beomjun Kim, Peter Richmond, Bertrand M. Roehner, Qing-hai Wang and Yang Yang EPL, 138 2 (2022) 22004 Published online: 23 May 2022 DOI: 10.1209/0295-5075/ac5cdd