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2. Long acting contraceptives: present status;BENAGIANO;Drugs,1983
3. POPULATION REPORTS. Long Acting Progestins – Promise and Prospects. Series K, Vol. 11, No. 2, Population Information Programs. Johns Hopkins University, Baltimore, pp. 17–55 (1983)
4. Long acting steroid contraception;MISHELL,1983
5. Long acting hormonal contraceptives;FRASER,1985