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Kramer, Bernd and Bills, Roger and Skelton, Paul and Wink, Michael (2012) A critical revision of the churchill snoutfish, genus Petrocephalus Marcusen, 1854 (Actinopterygii: Teleostei: Mormyridae), from southern and eastern Africa, with the recognition of Petrocephalus tanensis, and the description of five new species. Journal of Natural History 46 (35-36), pp. 2179-2258.