Thomas J. Givnish, Kendra C. Millam, Austin R. Mast, Thomas B. Paterson, Terra J. Theim, Andrew L. Hipp, Jillian M. Henss, James F. Smith, Kenneth R. Wood, Kenneth J. Sytsma
Proc Biol Sci. 2009 Feb 7; 276(1656): 407–416. Published online 2008 Oct 14. doi: 10.1098/rspb.2008.1204