1. Simpson KL, Katayama T, Chichester CO (1981) In: Bauernfeind JC (ed) Carotenoids as colorants and vitamin A precursors, Chap 4. Academic Press, New York
2. Simpson KL (1982) In: Martin RE (ed) Chemistry and biochemistry of marine food products, Chap 10. AVI Publishing, Westport
3. Ellis JN (1979) In: Halver JE, Tiews K (eds) Proc World Symp on Finfish Nutrition and Fishfeed Technology, Hamburg June 1978, vol II.: Heenemann Verlagsgesellschaft, Berlin, p 353
4. Danisco Bioteknologi A/S (1986) Annual report, p 13
5. Roche Denmark (1987) Personal communication