1. Brockmann, H., in Mellanby, E., and Ruzicka, L., Ergebnisse der Vitamin-und Hormonforschung, Leipzig, 2, 55 (1939).
2. Rosenberg, H. R., Chemistry and physiology of the vitamins, New York, 341 ff. (1942).
3. Whittier, C. C., U. S. patents 2,106, 779; 2, 106, 780; 2, 106, 781; 2, 106,782.
4. Comparative Toxicity of Three Forms of Vitamin D for Albino Rats
5. CHEMICAL AND BIOLOGICAL STABILITY OF CRYSTALLINE VITAMINS D2 AND D3 AND THEIR DERIVATIVES