IMMUNOHISTOPATHOLOGICAL CHANGES OF BONE TISSUE DURING CHRONIC GENERALIZED PERIODONTITIS ArticleSirak S.V., Shchetinin E.V., Garunov M.M., Grigoryants L.A., Andreev A.A., Petrosyan G.G., Dzgoeva M.G.Medical News of North Caucasus. Том 14. 2019. С. 532-535