Adil, S., M. H. Awan, I. Khan, and K. Syed. “Comparison of the Gonial Angle Measurements on Lateral Cephalogram and Both Hemispheres of Orthopantomogram”. Pakistan Orthodontic Journal, vol. 7, no. 2, Feb. 2016, pp. 48-50, https://poj.org.pk/index.php/poj/article/view/117.