A. S. Hameed, R. A. Malik, and J. A. Shaheen, “Comparative analysis between ethinyl estradiol & cyperoterone acetate with or without metformin therapy in the treatment of polycyctic ovarian syndrome induced hirsutism”, J Pak Assoc Dermatol, vol. 16, no. 2, pp. 88–92, Jan. 2017.