article 2002 Continuous use of oral contraceptive (OC) for endometriosis-associated recurrent dysmenorrhea not responding to cyclic pill regimen ·doi:10.1016/s0015-0282(01)03084-9
article 2002 Levonorgestrel-releasing intrauterine device (Lng-IUD) versus expectant management after conservative surgery for symptomatic endometriosis. A pilot study ·doi:10.1016/s0015-0282(01)03089-8