Title: Smith AG, et, al. Studies of the substrate specificity of cholesterol oxidase from Nocardia erythropolis in the oxidation of 3-hydroxy steroids. Biochem Soc Trans. 1975;3(5):675-7.
Title: Kokke WCMC, et, al. Isolation and synthesis of 23-methyl-22-dehydrocholesterol -a marine sterol of biosynthetic significance. Tetrahedron Letters. 1979; 20(18):3601-3604.