David W. Steadman, Paul S. Martin, Ross D. E. MacPhee, A. J. T. Jull, H. Gregory McDonald, Charles A. Woods, Manuel Iturralde-Vinent, Gregory W. L. Hodgins
Proc Natl Acad Sci U S A. 2005 Aug 16; 102(33): 11763–11768. Published online 2005 Aug 5. doi: 10.1073/pnas.0502777102