W. C.  Taylor, Lekschas, A. R., Qing, F. W., Liu, X., Napier, N. S., and Hoot, S. B., ?Phylogenetic relationships of Isoëtes (Isoëtaceae) in China as revealed by nucleotide sequences of the nuclear ribosomal ITS region and the second intron of a LEAFY homolog?, American Fern Journal, vol. 94, no. 4, pp. 196 - 205, 2004.