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Kramer, Bernd and Skelton, Paul and Van der Bank, Herman and Wink, Michael (2007) Allopatric differentiation in the Marcusenius macrolepidotus species complex in southern and eastern Africa: the resurrection of M. pongolensis and M. angolensis, and the description of two new species (Mormyridae, Teleostei). Journal of Natural History 41 (9-12), pp. 647-708.
Kramer, Bernd and Van der Bank, Herman and Wink, Michael (2004) Hippopotamyrus ansorgii species complex in the Upper Zambezi River System with a description of a new species,
H. szaboi (Mormyridae). Zoologica Scripta 33 (1), pp. 1-18.
Kramer, Bernd and Van der Bank, Herman and Flint, Nicolette and Sauer-Gürth, Hedi and Wink, Michael (2003) Evidence for Parapatric Speciation in the Mormyrid Fish, Pollimyrus castelnaui (Boulenger, 1911), from the Okavango–Upper Zambezi River Systems: P. marianne sp. nov., Defined by Electric Organ Discharges, Morphology and Genetics. Environmental Biology of Fishes 67 (1), pp. 47-70.