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