Affandi, B., Korver, T., Paul Geurts, T., Coelingh Bennink, H. and Gadroen, W. (1999) “A phase II study with a single implant contraceptive containing 3-ketodesogestrel (Implanon®): efficacy and safety”, Medical Journal of Indonesia, 8(1), pp. 25–30. doi: 10.13181/mji.v8i1.674.