T. A. Petrushanko, 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.