R. Shamakhi, M. Mubaraki, R. Dighriri, A. Almarir, and A. Alyahya, “Aplasia and agenesis of the frontal sinus in individual of southern region in Saudi Arabia”, Int J Otorhinolaryngol Head Neck Surg, vol. 7, no. 5, pp. 821–824, Apr. 2021.