Ali, A. . ., H. . . Khalafala, and H. Fadlalmola. “Menstrual Disorders Among Nursing Students at Al Neelain University, Khartoum State: Menstrual Disorders”. Sudan Journal of Medical Sciences, vol. 15, no. 2, June 2020, pp. 199-14, doi:10.18502/sjms.v15i2.7067.