Mahmoud, S. A., I. M. Saleh, and H. H. Khalaf. “The Correlation Between Maternal Hypomagnesemia and Preterm Labour”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, vol. 5, no. 8, Jan. 2017, pp. 2571-5, doi:10.18203/2320-1770.ijrcog20162624.