article 1994 High rates of pregnancy after long-term down-regulation of women with severe endometriosis American Journal of Obstetrics and Gynecology ·doi:10.1016/0002-9378(94)90103-1
review 1987 Current treatments with LHRH and its analogues. Recommendations of the ESHRE workshop. Anacapri, September 20, 1986 Human Reproduction ·doi:10.1093/oxfordjournals.humrep.a136508