Pryer, K. M.; Schneider, H.; Smith, A. R.; Cranfill, R.; Wolf, P. G.; Hunt, J. S.; Sipes, S. D. (2001). "Horsetails and ferns are a monophyletic group and the closest living relatives to seed plants". Nature. 409 (6820): 618–22. Bibcode:2001Natur.409..618S. doi:10.1038/35054555. PMID11214320. S2CID4367248.
Pryer, K. M.; Schuettpelz, E.; Wolf, P. G.; Schneider, H.; Smith, A. R.; Cranfill, R. (2004). "Phylogeny and evolution of ferns (monilophytes) with a focus on the early leptosporangiate divergences". American Journal of Botany. 91 (10): 1582–1598. doi:10.3732/ajb.91.10.1582. PMID21652310.
Rothwell, G. W. & Nixon, K. C. (2006). "How Does the Inclusion of Fossil Data Change Our Conclusions about the Phylogenetic History of Euphyllophytes?". International Journal of Plant Sciences. 167 (3): 737–749. doi:10.1086/503298. S2CID86172890.
Pryer, K. M.; Schneider, H.; Smith, A. R.; Cranfill, R.; Wolf, P. G.; Hunt, J. S.; Sipes, S. D. (2001). "Horsetails and ferns are a monophyletic group and the closest living relatives to seed plants". Nature. 409 (6820): 618–22. Bibcode:2001Natur.409..618S. doi:10.1038/35054555. PMID11214320. S2CID4367248.
Pryer, K. M.; Schneider, H.; Smith, A. R.; Cranfill, R.; Wolf, P. G.; Hunt, J. S.; Sipes, S. D. (2001). "Horsetails and ferns are a monophyletic group and the closest living relatives to seed plants". Nature. 409 (6820): 618–22. Bibcode:2001Natur.409..618S. doi:10.1038/35054555. PMID11214320. S2CID4367248.
Pryer, K. M.; Schuettpelz, E.; Wolf, P. G.; Schneider, H.; Smith, A. R.; Cranfill, R. (2004). "Phylogeny and evolution of ferns (monilophytes) with a focus on the early leptosporangiate divergences". American Journal of Botany. 91 (10): 1582–1598. doi:10.3732/ajb.91.10.1582. PMID21652310.
Pryer, K. M.; Schneider, H.; Smith, A. R.; Cranfill, R.; Wolf, P. G.; Hunt, J. S.; Sipes, S. D. (2001). "Horsetails and ferns are a monophyletic group and the closest living relatives to seed plants". Nature. 409 (6820): 618–22. Bibcode:2001Natur.409..618S. doi:10.1038/35054555. PMID11214320. S2CID4367248.
Rothwell, G. W. & Nixon, K. C. (2006). "How Does the Inclusion of Fossil Data Change Our Conclusions about the Phylogenetic History of Euphyllophytes?". International Journal of Plant Sciences. 167 (3): 737–749. doi:10.1086/503298. S2CID86172890.