AFFANDI, B.; KORVER, T.; PAUL GEURTS, T.; COELINGH BENNINK, H.; GADROEN, W. A phase II study with a single implant contraceptive containing 3-ketodesogestrel (Implanon®): efficacy and safety. Medical Journal of Indonesia, v. 8, n. 1, p. 25-30, 1 Jan. 1999.