An asymptotically self-similar solution of the problem of three-dimensional gas flow through a porous medium

An exact solution of the Cauchy problem is constructed for the equation describing the three-dimensional molecular diffusion of a gas. The result obtained is a natural generalization of the solution of the analogous Boussinesq problem. Dnepropetrovsk. Translated from Izvestiya Akademii Nauk SSSR, Mekhanika Zhidkosti i Gaza, No. 5, pp. 178–180, September–October, 1988.