1. Hemipenial morphology of African snakes: a taxonomic review. Part I. Scolecophidia and Boidae;BRANCH;Journal of Herpetology,1986
2. Molecular systematics of neotropical xenodontine snakes: II. Central American xenodon***ines;CADLE;Herpetologica,1984
3. Catalogue of the Colubridae in the Museum of the Academy of Natural Sciences of Philadelphia, with notes and descriptions of new species. Part II;COPE;Proceedings of the Academy of Natural Sciences of Philadelphia,1860