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↑(en) C. C. Swisher, Xiaolin Wang, Zhonghe Zhou, Yuanqing Wang, Fan Jin, Jiangyong Zhang, Xing Xu, Fucheng Zhang, Yuan Wang, 2002, Further support for a Cretaceous age for the feathered-dinosaur beds of Liaoning, China:New 40Ar÷39Ar dating of the Yixian and Tuchengzi Formations, Chin.Sci.Bull. (2002) 47: 136. https://doi.org/10.1360/02tb9031, [1]