Fik, V., Y. Paltov, and Y. Kryvko. “Ultrastructural Condition of Rats Periodontal Tissue in Opioid Influence During Two Weeks and After Its Four-Week Withdrawal on Correction”. Reports of Morphology, Vol. 25, no. 2, June 2019, pp. 49-55, doi:10.31393/morphology-journal-2019-25(2)-06.