Petrushanko, T. A., T. N. Moshel, O. V. Hancho, I. Y. Popovich, T. D. Bubliy, and N. A. Bobrova. “Effectiveness of NBF Gingival Gel Use for Treatment of Patients With Chronic Catarrhal Gingivitis”. Zaporozhye Medical Journal, no. 2, Mar. 2018, doi:10.14739/2310-1210.2018.02.125174.