ICMR Task Force Study on hormonal contraception. Transfer of norethisterone (NET) and levonorgestrel (LNG) from a single tablet into the infant's circulation through the mother's milk - Betrabet,S.S.; Shikary,Z.K.; Toddywalla,V.S.; Toddywalla,S.P.; Patel,D.; Saxena,B.N. (Contraception, 1987)