↑ Clément, G.; Janvier, P. (2004). "Powichthys spitsbergensis sp. nov., a new member of the Dipnomorpha (Sarcopterygii, lobe-finned fishes) from the Lower Devonian of Spitsbergen, with remarks on basal dipnomorph anatomy" . Fossils and Strata . 50 : 92–112 . doi : 10.18261/9781405169868-2004-07 . ISBN9781405169868。