Ubilla, M.; Perea, D.; Bond, M.; Rinderknecht, A. (2011). "The first cranial remains of the Pleistocene proterotheriid Neolicaphrium Frenguelli, 1921 (Mammalia, Litopterna): a comparative approach". Journal of Vertebrate Paleontology. 31 (1): 193–201. Bibcode:2011JVPal..31..193U. doi:10.1080/02724634.2011.539647. S2CID84000052.
Ubilla, M.; Perea, D.; Bond, M.; Rinderknecht, A. (2011). "The first cranial remains of the Pleistocene proterotheriid Neolicaphrium Frenguelli, 1921 (Mammalia, Litopterna): a comparative approach". Journal of Vertebrate Paleontology. 31 (1): 193–201. Bibcode:2011JVPal..31..193U. doi:10.1080/02724634.2011.539647. S2CID84000052.
Ubilla, M.; Perea, D.; Bond, M.; Rinderknecht, A. (2011). "The first cranial remains of the Pleistocene proterotheriid Neolicaphrium Frenguelli, 1921 (Mammalia, Litopterna): a comparative approach". Journal of Vertebrate Paleontology. 31 (1): 193–201. Bibcode:2011JVPal..31..193U. doi:10.1080/02724634.2011.539647. S2CID84000052.