1. Arnett RTP Whelan J 2001. Comparing the diet of cod (Gadus morhua) and grey seals (Halichoerus grypus): an investigation of secondary ingestion. J. Mar. Biol. Assoc. UK 81(2):365-366.
2. Blanquer A Alayse JP Berrada-Rkhami O Berrebi P 1992. Allozyme variation in turbot (Psetta maxima) and brill (Scophthalmus rhombus) (Osteichthyes Pleuronectiformes Scophthalmidae) throughout their range in Europe. Journal of Fish Biology 41(5):725-736.
3. FishBase 2004. Entry for Scophthalmus rhombus. Main ref. Bauchot M-L 1987. Poissons osseux. In: Fischer W Bauchot ML Schneider M eds. Fiches FAO d’identification pour les besoins de la pêche. (rev. 1). Méditerranée et mer Noire. Zone de pêche 37. Vol. II. Commission des Communautés Européennes and FAO Rome 891-1421. Online at www.fishbase.org. Accessed 10 July 2004.
4. Hall AJ Watkins J Hammond PS 1998. Seasonal variation in the diet of harbour seals in the south-western North Sea. Mar. Ecol. Prog. Ser. 170:269-281.
5. Hureau J-C Monod TH 1979. Check-list of the fishes of the north-eastern Atlantic and of the Mediterranean (CLOFNAM I and II). Paris France: United Nations Educational Scientific and Cultural Organization (UNESCO) Volumes 1-2 683 pp.