1. E. M. Kreps, Ukr. Biokhim. Zh., No. 5, 734 (1965).
2. L. M. Kul'berg and M. B. Malyarskaya, Vrach. Delo, No. 9, 810 (1951).
3. L. K. Finagin and T. M. Pechenova, Ukr. Biokhim. Zh., No. 5, 645 (1971).
4. H. Van Belle, Cholesterol, Bile Acids and Atherosclerosis, Amsterdam (1965), p. 76.
5. S. Bergström and H. Danielsson, Acta Physiol. Scand.,43, 1 (1958).