References
- Borell U. Contraceptive methods–-their safety, efficacy and acceptibility. Acta Obstet Gynec Scand 1966; 45(Suppl. 1)28
- Hines D. C., Goldzieher J. W. Large-scale study of an oral contraceptive. Fertil Steril 1968; 19: 841–866
- Mears E. A new type of oral contraceptive. Brit Med J 1963; 1: 1318–1320
- Mears E. Agents Affecting Fertility, C. R. Austin, J. S. Perry. J. L. Churchill Ltd, London 1965; 62
- Tietze C. Manual of Contraceptive Practice, M. S. Calderone. Williams & Wilkins Co., Baltimore 1964; 126