Japanese Patent 7,008,221
Beam CA, Himes M. Distribution of members of the Crypthecodinium cohnii (Dinophyceae) species complex. J. Protozool. 29: 8-15, 1982.
Iizuka T, et al. Marine micro-algae food material containing docosahexaenoic acid, food containing the same and manufacturing method therefor. US Patent 5,547,699 dated Aug 20 1996