[1]
Q. Wang, Z. Zhao, X. Wang, N. Li, and S. Zou, “A new form of Elongatoolithidae, Undulatoolithus pengi oogen. et oosp. nov. from Pingxiang, Jiangxi, China”, Zootaxa, vol. 3746, no. 1, pp. 194–200, Dec. 2013.