Ibrahim, A. R., Omer, Z. Q., Hasan, H. S. and Saleem Almola, W. M. (2020) “Bolton Ratio of Different Angle’s Classifications in a School Children Sample of Erbil City: A Cross‑sectional Study”, Polytechnic Journal, 10(2), pp. 87-97. doi: 10.25156/ptj.v10n2y2020.pp87-97.