Nielsen, E. (1932)
Permo-Carboniferous Fishes from East Greenland. Meddelelser om Grønland, 86(3), 1–63
Branson, C.C. (1934)
Permian sharks of Wyoming and of east Greenland. Science, 79(2054), 431
DOI: 10.1126/science.79.2054.431