Harper, K., Ocampo, P., Steiner, B., George, R., Silverman, M., Bolotin, S., . . . Armelagos, G. (2008). On the origin of the Treponematoses: A phylogenetic approach. Public Library of Science.

Harper, K., P. Ocampo, B. Steiner, R. George, M. Silverman, S. Bolotin, A. Pillay, N. Saunders, and G. Armelagos. On the Origin of the Treponematoses: A Phylogenetic Approach. Public Library of Science, 2008.

Harper, K., et al. On the Origin of the Treponematoses: A Phylogenetic Approach. Public Library of Science, 2008.