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- Act. 1_16, von L. Viinikka et al., "Biological effects of a new and potent
progestagen. A clinical study", Acta Endocrinologica, 1976, 83, 429-438;

- Act. 1_17, von L. Viinikka et al., “Ovulation inhibition by a new bw-dose
progestagen‘, Contraception, July 1977, 16 (1), 51-58.