Project 4119: E. J. Hermsen, T. N. Taylor, E. L. Taylor, D. W. Stevenson. 2006. Cataphylls of the Middle Triassic cycad Antarcticycas schopfii and new insights into cycad evolution. American Journal of Botany. 93 (5):724-738.
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E. J. Hermsen, T. N. Taylor, E. L. Taylor. 2006. Cataphylls of the Middle Triassic cycad Antarcticycas schopfii and new insights into cycad evolution. American Journal of Botany. Vol. 93(5), pp. 724-738.