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辽西义县组鹦鹉嘴龙(鸟臀目,角龙亚目)新材料及其地层学意义
徐星, 汪筱林
NEW PSITTACOSAUR (ORNITMSCEUA, CERATOPSIA) OCCURRENCE FROM THE YIXIAN FORMATION OF LIAONING, CHINA AND ITS STRATIGRAPHICAL SIGNIFICANCE
XU Xing, WANG Xiaolin
古脊椎动物学报 . 1998, (02): 147 -158 .