Levytska, S. A., and A. I. Gozhenko. “Tonsillectomy in Children With PFAPA-Syndrome and Epstein-Barr Viral Infection”. Journal of Education, Health and Sport, vol. 7, no. 3, Mar. 2017, pp. 600-5, https://apcz.umk.pl/JEHS/article/view/4440.