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Fusco, A. C. & J. R. Palmieri. (1980). Heliconema serpens sp. n. (Nematoda: Physalopteridae) and Camallanides malayemis sp. n. (Nematoda: Camallanidae) from Cerberus rhynchops (Schneider) (Reptilia: Colubridae) in Malaysia. Proceedings of the Helminthological Society of Washington. 47: 72-79.