Pei, Xirong and Li, Yang'an. Henan Orthodox Xingyi Quan. Trans. Joseph Candrall. Pinole: Smiling Tiger Press, 1994. See also, Xing Yi Quan (Mind-Form Boxing) Books Scroll down, 5th book from the top.
Zhang Jun, Han Shizhong, and Liu Guangshi were three of the four generals who stopped the state officials Miao Fu (苗傅) and Liu Zhengyan (劉正彥) from usurping the throne from Emperor Gaozong of Song. (See here also)