KOCHAKIAN CD, CARROLL BR, UHRI B. Comparisons of the oxidation of C19-hydroxysteroids by guinea pig liver homogenates. J. Biol. Chem. 1957, 224 (2): 811–8. PMID 13405910.
Marcus PI and Talalay P. Induction and purification of alpha- and beta-hydroxysteroid dehydrogenases. J. Biol. Chem. 1956, 218 (2): 661–674. PMID 13295221.