Ecologically distinct dinosaurian sister group shows early diversification of Ornithodira
S. J. Nesbitt,
C. A. Sidor,
R. B. Irmis,
K. D. Angielczyk,
R. M. H. Smith, and
L. A. Tsuji
2010
Article
Nature
464:95-98
Find it at:
http://dx.doi.org/10.1038/nature08718