1. Voluntary sterilisation for family welfare;Blacker;Lancet,1966
2. Recent trends in sterilisation;Bone;Population Trends,1978
3. Vasectomy reviewed;Hackett;Am J Obstet Gynecol,1973
4. Population and Family Planning Programs;Nortman,1978
5. Voluntary sterilisation in the male;Roberts;Br Med J,1968