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甘肃晚二叠世二齿兽化石的发现及相关地层研究
李佩贤, 程政武, 李锦玲
A NEW SPECIES OF DICYNODON FROM UPPER PERMIAN OF SUNAN, GANSU, WITH REMARKS ON RELATED STRATA
Ll Pei-Xian, CHENG Zheng-Wu, Ll Jin-Ling
古脊椎动物学报 . 2000, (02): 147 -157 .