Authors: Grant D Zazula; Ross D E MacPhee; Jessica Z Metcalfe; Alberto V Reyes; Fiona Brock; Patrick S Druckenmiller; Pamela Groves; C Richard Harington; Gregory W L Hodgins; Michael L Kunz; Fred J Longstaffe; Daniel H Mann; H Gregory McDonald; Shweta Nalawade-Chavan; John R Southon Journal: Proc Natl Acad Sci U S A Date: 2014-12-01 Impact factor: 11.205