* Miramontes Luis E., Romero Miguel A, Ahuad Farjat Fortunato (1959), "Preparation of 6-methyl steroids of the pregnane series from diosgenin", United States Patent 2878246.
* Miramontes Luis E., Romero Miguel A, Ahuad Farjat Fortunato (1959), "Preparation of 6-methyl steroids of the pregnane series from diosgenin", .