1. Medicated Devices and Methods;Duncan,1970
2. Contraception by means of a silastic vaginal ring impregnated with medroxyprogesterone acetate;Mishell;Am. J. Obstet. Gynecol.,1970
3. Contraceptive effect of varying dosages of progestogen in silastic vaginal rings**supported by grants from the Ford Foundation and the Upjohn Company;Mishell;Fertil. Steril.,1970
4. The use of silicone rubber as a carrier for prolonged drug therapy;Folkman;J. Surg. Res.,1964
5. Polysiloxane Carriers for Controlled Release of Drugs and Other Agents, US Patent Number 3,279,996, filed August 28, 1962., 996;Long,1966