1. McCollum FG, Simmonds N, Shipley PG, Park EA: Studies on experimental rickets. XVI. A delicate biological test for calcium-depositing substances. J. Biol. Chem. 54: 41–50, 1922.
2. Schultzer P: CLXXXIX. Investigations on the determination of vitamin D. Comparison between the preventive and the curative methods. Biochem. J. 25: 745–754, 1931.
3. U.S. Pharmacopeia XVI, Mack Printing Co. (ed), p. 910.
4. McCollum EV, Simmonds N, Becker JE: Studies on experimental rickets. XXI. An experimental demonstration of the existence of a vitamin which promotes calcium deposition. J. Biol. Chem. 53: 292–312, 1922.
5. Soames KM, Leigh-Clare JC: LXVI. The assay of the antirachitic vitamin D. J. Biochem. 22: 522–527, 1928.