Affandi, B. (1999) “A multicentred phase III comparative study between single-implant containing 3-ketodesogestrel (Implanon®) and implants containing levonorgestrel (Norplant®) II. Vaginal bleeding patterns”, Medical Journal of Indonesia, 8(1), pp. 56–61. doi: 10.13181/mji.v8i1.678.