The Spring-Autumn and Warring States period coldness (400–350 BCE) contributed to the social unrest evidenced from coffin tree rings in southeastern China - Min Zhou; Zhongcai Xiao; Xin Jia; Xuanbo Wang; Liangsai Zhu; Feifei Zhou; Di Zhang; Zepeng Mei; Mengling Liu; Xinyuan Kong; Keyan Fang (Quaternary Science Reviews, 2025)