Shahzad, N., F. Saleem, M. Shahid, and A. Malik. “COMPARISON BETWEEN NIFEDIPINE AND RITODRINE AS AN EFFECTIVE TOCOLYTIC AGENT FOR PRETERM LABOUR”. Annals of King Edward Medical University, vol. 21, no. 2, 1, p. 113, doi:10.21649/akemu.v21i2.708.