Haswell, W.A. (1885)
Studies on the elasmobranch skeleton.
Proceedings of the Linnean Society of New South Wales, ser. 1, 9, 71–119
Jungersen, H.F.E. (1899)
On the appendices genitales in the Greenland shark, Somniosus microcephalics (Bl. Schn.), and other selachians.
The Danish Ingolf–Expedition, 2(2): 84pp