Jimi system
Yuan, Bolan, Min, Shenglan and Huang, Li. "Tang Song Minzu Zhengce Jimi Wenti Zhi Bijiao Yanjiu" ("Ethnic Policy of the Tang and Song Dynasties, A Comparative Study on the Question  of Jimi") . Journal of Northwest University for Nationalities. 2004.5. ISSN 1001-5140.