FOWLER, G. M.; STOBO, W. T. Patterns of abundance and maturity among three species of parasitic nematodes (Pseudoterranova decipiens, Contracaecum osculatum, Anisakis simplex) co-existing in Sable Island grey seals (Halichoerus grypus). NAMMCO Scientific Publications, v. 3, p. 149–160, 24 Nov.2001.