More ramapithecus skulls found from Lufeng, Yunnan ——report on the excavation of the site in 1981
Wu Rukang, Han Defen, Xu Qinghua, Qi Guoqin, Lu Qingwu, Pan Yuerong, Chen Wanyong
Acta Anthropologica Sinica . 1982, (02): 101 -108 .