Project 682: T. E. Williamson, S. L. Brusatte, T. D. Carr, A. Weil, B. R. Standhardt. 2012. The phylogeny and evolution of Cretaceous-Palaeogene metatherians: cladistic analysis and description of new early Palaeocene specimens from the Nacimiento Formation, New Mexico. Journal of Systematic Palaeontology. 10 (4):625-651.