Devaraj, A. R. P., K. C. Prasad, A. Karunasagar, M. J. Pappanacherry, H. N. Gowda, S. S. Nair, and B. H. Subramani. “Implication of Osteoplastic Flap for Frontal Sinus Surgery in the Endoscopic Era”. International Journal of Otorhinolaryngology and Head and Neck Surgery, vol. 5, no. 6, Oct. 2019, pp. 1717-22, doi:10.18203/issn.2454-5929.ijohns20194958.