Kliuchka, Ye. A., et al. “Factors Responsible for Formation of Severity of Inflammatory Parodontal Diseases in Adolescent Girls With Menstrual Dysfunction”. Journal of Education, Health and Sport, vol. 7, no. 6, June 2017, pp. 1160-8, https://apcz.umk.pl/JEHS/article/view/5489.