Palacios, M. K., J. P. Amable, and K. Capio. “Radiologic Evaluation of the Anterior and Posterior Ethmoidal Foramen and Optic Canal by Paranasal Sinus Computed Tomography Scan Among Adult Filipinos”. Philippine Journal of Otolaryngology Head and Neck Surgery, vol. 37, no. 1, June 2022, p. 20, doi:10.32412/pjohns.v37i1.1733.