Steimbach, Laiza Maria, et al. “METFORMIN USAGE TO INDUCE OVULATION IN WOMEN WITH POLYCYSTIC OVARY SYNDROME: META-ANALYSIS”. International Journal of Pharmacy and Pharmaceutical Sciences, vol. 8, no. 11, Nov. 2016, pp. 86-89, doi:10.22159/ijpps.2016v8i11.9517.