Kramer, B., van der Bank, F. Herman, Flint, N., Sauer-Gürth, H. & Wink, M. 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, 47 - 70 (2003).

Kramer, B. & van der Bank, F. Herman. The southern churchill, Petrocephalus wesselsi, a new species of mormyrid from South Africa defined by electric organ discharges, genetics, and morphology. Environmental Biology of Fishes 59, 393-413 (2000).

Kramer, B., Skelton, P., van der Bank, F. Herman & Wink, M. 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, 647-708 (2007).

Kramer, B., van der Bank, F. Herman & Wink, M. Hippopotamyrus ansorgii species complex in the Upper Zambezi River System with a description of a new species, H. szaboi (Mormyridae). Zoologica Scripta 33, 1 - 18 (2004).

Kramer, B. & van der Bank, F. Herman. The Victoria Falls, a species boundary for the Zambezi Parrotfish, Cyphomyrus discorhynchus (Peters, 1852), and the resurrection of Cyphomyrus cubangoensis (Pellegrin, 1936) (Mormyridae: Teleostei). Journal of Natural History 45, (2011).

Kramer, B., van der Bank, F. Herman & Wink, M. Marked differentiation in a new species of dwarf stonebasher, Pollimyrus cuandoensis sp. nov. (Mormyridae: Teleostei), from a contact zone with two sibling species of the Okavango and Zambezi rivers. Journal of Natural History 1 - 35 (2014). doi:10.1080/00222933.2013.807950