Jennifer Read, Gordon D. Sanson, Elizabeth Caldwell, Fiona J. Clissold, Alex Chatain, Paula Peeters, Byron B. Lamont, Michel De Garine-Wichatitsky, Tanguy Jaffré, Stuart Kerr
Ann Bot. 2009 Mar; 103(5): 757–767. Published online 2008 Dec 19. doi: 10.1093/aob/mcn246