Citations for: Hobe, G.; Schön, R.; Frankenberg, G.; Schade, W.; Schubert, K. Urinary Metabolites of the New Progestagen STS 557 (17α-Cyanomethyl-17-Hydroxy-4,9-Estradien-3-One) in the Dog and Rat. Steroids 1983, 41 (1), 23–33.