Yongdong, Wang, Shen Guanglong, and Wu Xiuyuan. 1996. “Micro- and Megafloral Remains of Namurian H-G1 Zones from Zhongwei of Ningxia, China”. Journal of Palaeosciences 45 (December):224-32. https://doi.org/10.54991/jop.1996.1237.