Type	Article
Authors(s)	Pryer KM, Schuettpelz E, Wolf PG, Schneider H, Smith AR, Cranfill R.
Year	2004
Title	Phylogeny and evolution of ferns (monilophytes) with a focus on the early leptosporangiate divergences.
Periodical	American Journal of Botany
Volume	91
Page(s)	1582–1598