Kossov, V., and O. Fedorenko. “Inversion of the Density Gradient under Multicomponent Mixing of Gases in the Vertical Cylindrical Channel”. Recent Contributions to Physics, vol. 2013, no. 4, Dec. 2013, pp. 37-44, https://bph.kaznu.kz/index.php/zhuzhu/article/view/755.