Authors: Schoonen, WGEJ Deckers, G de Gooijer, ME de Ries, R Mathijssen-Mommers, G Hamersma, H Kloosterboer, HJ

Citation: Wgej. Schoonen et al., Contraceptive progestins. Various 11-substituents combined with four 17-substituents: 17 alpha-ethynyl, five- and six-membered spiromethylene ethers or six-membered spiromethylene lactones, J STEROID B, 74(3), 2000, pp. 109-123