A new mammal skull from the Lower Cretaceous of China with implications for the evolution of obtuse-angled molars and "amphilestid" eutriconodonts, Wilson Gregory P, Gao Chung-ling, Luo Zhe-Xi, Maga A M, Meng Q, and Wang X, Proceedings of the Royal Society B: Biological Sciences, 2010, Volume 277, p.237-246 (2010)