Pryer, K. M., Schuettpelz, E., Wolf, P. G., Schneider, H., Smith, A. R. & Cranfill, R., Phylogeny and evolution of ferns (monilophytes) with a focus on the early leptosporangiate divergences, American Journal of Botany, 2004, 91: 1582–1598, PMID 21652310, doi:10.3732/ajb.91.10.1582
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Pryer, K. M., Schuettpelz, E., Wolf, P. G., Schneider, H., Smith, A. R. & Cranfill, R., Phylogeny and evolution of ferns (monilophytes) with a focus on the early leptosporangiate divergences, American Journal of Botany, 2004, 91: 1582–1598, PMID 21652310, doi:10.3732/ajb.91.10.1582