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Bratton, Bradford O. and Kramer, Bernd (1989) Patterns of the electric organ discharge during courtship and spawning in the mormyrid fish, Pollimyrus isidori. Behavioral Ecology and Sociobiology 24 (6), pp. 349-368.
Bratton, Bradford O. and Kramer, Bernd (1988) Intraspecific variability of the pulse-type discharges of the African electric fishes, Pollimyrus isidori and Petrocephalus bovei (Mormyridae, Teleostei), and their dependence on water conductivity. Experimental Biology 47, pp. 227-238.