Wang, Q., Zhao, Z., Wang, X., Li, N. and Zou, S. 2013. A new form of Elongatoolithidae, Undulatoolithus pengi oogen. et oosp. nov. from Pingxiang, Jiangxi, China. Zootaxa. 3746, 1 (Dec. 2013), 194–200. DOI:https://doi.org/10.11646/zootaxa.3746.1.9.