1. Prolonged effectiveness of Norplant capsule implants;Sivin;Contraception,2000
2. Jadelle two-rod levonogestrel contraceptive implants;McIntosh,1998
3. New developments on implantable contraceptives for women;Rusdianto,2001
4. Why are US women not using long-acting contraceptives?;Tanfer;Fam Plan Perspes,2000
5. Ethiopia demographic health survey, 2000. A preliminary report,2001