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