K. C.  Nixon and Davis, J. I., ?Polymorphic taxa, missing values and cladistic analysis?, Cladistics, vol. 7, pp. 233-241, 1992.

K. C.  Nixon and Davis, J. I., ?Polymorphic taxa, missing values and cladistic analysis?, Cladistics, vol. 7, pp. 233-241, 1993.

J. J.  Doyle, Davis, J. I., Soreng, R., Garvin, D., and Anderson, M., ?Chloroplast DNA inversions and the origin of the grass family Poaceae?, Proceedings of the National Academy of Science, U.S.A., vol. 89, pp. 7722-7726, 1992.

J. I.  Davis, ?A phylogenetic structure for the monocotyledons, as inferred from chloroplast DNA restriction site variation,mm and a comparison of measures of clade support?, Systematic Botany, vol. 20, pp. 503-527, 1995.

J. I.  Davis, Frohlich, R. W., and Soreng, R., ?Cladistic characters and cladogram stability?, Systematic Botany, vol. 18, pp. 188-196, 1993.