Un articulo sobre hibridos en Heliconius. *Natural hybridization in heliconiine butterflies: the species boundary as a continuum http://www.biomedcentral.com/1471-2148/7/28/ James Mallet, Margarita Beltran, Walter Neukirchen, Mauricio Linares */BMC Evolutionary Biology/ 2007, *7*:28 (23Feb2007)