NIU Zhi-jun, DUAN Qi-fa, WANG Jian-xiong, BAI Yun-shan, TU Bing, BU Jian-jun. 2006: Discovery of the upper part of the Permian Yanghsinian Series and establishment of the Garizaren and Suojia formations in the Zhidoi-Zadoi area, southern Qinghai, China. Geological Bulletin of China, 25(1): 176-182. DOI: 10.12097/gbc.20060128