Sharman, A., I. Yermakova, E. Erenchina, G. Tyulebekova, and A. Bekzhanova. “Respiratory Function and Physical Capacity in Combustible Cigarettes and Heated Tobacco Products Users: A Two-Year Follow-Up Cohort Study”. Global Journal of Respiratory Care, vol. 7, Nov. 2021, pp. 27-34, doi:10.12974/2312-5470.2021.07.05.