Munjal, M., S. Puri, G. Matta, and S. Munjal. “The Frontal Sinus- Physiological and Pathophysiological Aspects- an endoscopist’s Perspective: A Review”. International Journal of Otorhinolaryngology and Head and Neck Surgery, vol. 6, no. 10, Sept. 2020, pp. 1937-40, doi:10.18203/issn.2454-5929.ijohns20204208.