Ognivenko, E., N. Popov, and E. Romanova. “ANTIMICROBIAL IMMUNITY CONDITION IN PATIENTS WITH PURULENT MAXILLARY SINUSITIS”. The Journal of V. N. Karazin Kharkiv National University, Series "Medicine", no. 15, 1, pp. 110-4, https://periodicals.karazin.ua/medicine/article/view/7019.