D. L.  Swofford, Olsen, G. J., Waddell, P. J., and Hillis, D. M., ?Phylogenetic inference?, in Molecular systematics, 2ndnd ed., D. M.  Hillis, Moritz, C., and Mable, B. K., Eds. Sunderland: Sinauer Associates, 1996, pp. 407-514.