Zhdanova, N., and E. Ryabokon. “The Study of Clinical Indicators in the Treatment of Chronic Apical Periodontitis by Photo-Activated Disinfectionand Temporary Root Obturation ”. Experimental and Clinical Dentistry, Vol. 1, no. 1, Dec. 2017, pp. 17-20, https://ecd.knmu.edu.ua/article/view/40.