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: 618–622.
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| 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: 618–622. |