1. A collaborative study of the progesterone intrauterine device (Progestasert);Newton, J.; Szontagh, F.;Contraception,1979
2. A review of the association between intrauterine devices and acute pelvic inflammatory disease;Ory, H.W.;J Reprod Med,1978
3. Incidence, trends, and risks of ectopic pregnancy in a population of women;Westrom, L.; Bengtsson, L.P.H.; Mardh, P.H.;Br MedJ7
4. Intrauterine contraception with Nova-T and Copper-T-200 during three years;Nygren, K.G.; Nielsen, N.C.; Pyorala, T.;Contraception,1981
5. The ML Cu250; clinical experience in Belgium and the Netherlands;Thiery, M.; Van Kets, H.; Van der Pas, H.;Br J Obstet Gynaecol,1982