Pryer K.M. et al 2004. Phylogeny and evolution of ferns (monilophytes) with a focus on the early leptosporangiate divergences. American Journal of Botany91: 1582-1598 (available onlineArchived 2007-09-26 at the Wayback Machine; pdf file)
web.archive.org
Pryer K.M. et al 2004. Phylogeny and evolution of ferns (monilophytes) with a focus on the early leptosporangiate divergences. American Journal of Botany91: 1582-1598 (available onlineArchived 2007-09-26 at the Wayback Machine; pdf file)