N. . Karim, K. . Mustafa, T. . Hoor, and R. . Farooqui, “Effect of Metformin Versus Diet and Exercise on Ovulation & Menstrual Regularity in PCOS”, J. Bahria Univ. Med. Dent. Coll., vol. 2, no. 1, pp. 17–23, Jan. 2012.