Caliskan, E., O. Berk Gul, and M. Ozturk. “Normative Data for Trachea and Main Bronchi Dimensions on Computed Tomography in Children and Adolescents”. Annals of Medical Research, vol. 27, no. 7, May 2021, pp. 1869-74, http://annalsmedres.org/index.php/aomr/article/view/872.