Aasen, O. (1963)
Length and growth of the porbeagle (Lamna nasus Bonnaterre) in the north west Atlantic. Fiskeridirektoratets skrifter,(Serie Havundersøkelser), 13(6): 20–37, figs 1–5, pls 1–2
Aasen, O. (1961)
Some observations on the Biology of the Porbeagle Shark (Lamna nasus L.). ICES CM. Near Northern Seas Comm.,(109): 7 pp