Two new species of tetraphyllidean cestodes in Himantura pacifica (Chondrichthyes: Myliobatiformes: Dasyatididae) from the northwest coast of Costa Rica. Journal of Parasitology, 82(2), 302–306
Evolution of Neotropical freshwater stingrays and their parasites: taking into account space and time. Unpublished PhD dissertation, University of Toronto, Toronto.
Checklist of the helminth parasites of vertebrates in Costa Rica. Revista de Biología Tropical, 52: 1–41
