Valente, P., M. Farinha, M. Jácome, J. Guimarães, and E. Monteiro. “Treatment Outcomes of Sinonasal Tumours With Neuroendocrine Features”. International Journal of Otorhinolaryngology and Head and Neck Surgery, vol. 7, no. 2, Jan. 2021, pp. 221-8, doi:10.18203/issn.2454-5929.ijohns20210151.