Romanova, Y., and ZolotukhinаA. “Influence of Exogenous Factors – Smoking and Concomitant Pathology on Gastrointestinal Condition on the Storage of Periodontal Tissues (review of Literature)”. Experimental and Clinical Dentistry, Vol. 2, no. 1, Apr. 2018, pp. 14-17, https://ecd.knmu.edu.ua/article/view/66.