Authors: Elwyn L Simons; Friderun Ankel-Simons; Prithijit S Chatrath; Richard S Kay; Blythe Williams; John G Fleagle; Daniel L Gebo; Christopher K Beard; Mary Dawson; Ian Tattersall; Kenneth D Rose Journal: Nature Date: 2009-07-23 Impact factor: 49.962
Authors: Jens L Franzen; Philip D Gingerich; Jörg Habersetzer; Jørn H Hurum; Wighart von Koenigswald; B Holly Smith Journal: PLoS One Date: 2009-05-19 Impact factor: 3.240