Botella J, Duc I, Delansorne R, Paris J, Lahlou B (December 1990). "Structure-activity and structure-affinity relationships of 19-nor-progesterone derivatives in rat uterus". J. Endocrinol. Invest. 13 (11): 905–10. doi:10.1007/BF03349652. PMID2090671. S2CID37429648.
Botella J, Duc I, Delansorne R, Paris J, Lahlou B (December 1990). "Structure-activity and structure-affinity relationships of 19-nor-progesterone derivatives in rat uterus". J. Endocrinol. Invest. 13 (11): 905–10. doi:10.1007/BF03349652. PMID2090671. S2CID37429648.
Botella J, Duc I, Delansorne R, Paris J, Lahlou B (December 1990). "Structure-activity and structure-affinity relationships of 19-nor-progesterone derivatives in rat uterus". J. Endocrinol. Invest. 13 (11): 905–10. doi:10.1007/BF03349652. PMID2090671. S2CID37429648.