Shankar, M. N., Selvan, V. S., & Sreedharan, N. (2017). An observational study comparing the effect of sphenopalatine artery block on bleeding in endoscopic sinus surgery. International Journal of Otorhinolaryngology and Head and Neck Surgery, 3(4), 1010–1014. https://doi.org/10.18203/issn.2454-5929.ijohns20174323