A.Kaluarachchi, S A Liyanage, M D S Renuka, R.N.Panagoda, K A D C Siddhisena, H R Seneviratne. Study on knowledge and use of contraceptives among teenage pregnant mothers at a tertiary care hospital.  39^th Annual scientific sessions of the Sri Lanka College of Obstetricians & Gynaecologists, October 2006