* Miramontes Luis E., Fritsche Oscar, Romero Miguel A (1963), "DEHYDRO-OXYGENATED-6-METHYL-16.alpha.,17.alpha.-EPOXYPREGN-20-ONE-DERIVATIVES", Canada Patent CA 673756.
* Miramontes Luis E., Fritsche Oscar, Romero Miguel A (1963), "DEHYDRO-OXYGENATED-6-METHYL-16.alpha.,17.alpha.-EPOXYPREGN-20-ONE-DERIVATIVES", Canada Patent CA 673756.