Pullarat, A. N., M. F. C. K., M. P. Nampoothiri, and S. R. “A Descriptive Study of the Patients With Orbital Complication of Acute and Chronic Sinusitis”. International Journal of Otorhinolaryngology and Head and Neck Surgery, vol. 4, no. 4, June 2018, pp. 990-6, doi:10.18203/issn.2454-5929.ijohns20182495.