References
Bursey, C,R. and Brooks, D.R. 2011. Nematode parasites of Costa Rican snakes (Serpentes) with description of a new species of Abbreviata (Physalopteridae). Comparative Parasitology 78:333–358.
Ogden, C.G. 1969. A revision of the genus Heliconema Travassos, 1919, Physalopteridae (Nematoda). Journal of Natural History, 3:423-431.
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