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JONATHAN J. M. CALEDE and SAMANTHA S. B. HOPKINS. (2012). NEW MATERIAL OF ALPHAGAULUS PRISTINUS (MAMMALIA, RODENTIA MYLAGAULIDAE) FROM THE DEEP RIVER FORMATION (MONTANA, U.S.A.): IMPLICATIONS FOR ECOLOGY, ONTOGENY, AND PHYLOGENY. Journal of Vertebrate Paleontology, 32(1), 151–165. doi:10.2307/41407714 
10.2307/41407714