Geodesic
The asymptotic solution of the equation describing the polytropic gas filtration in a~nonhomogeneous porous medium.~2
Matematičeskoe modelirovanie, Tome 3 (1991) no. 3, pp. 97-108.

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The process of gas filtration in a strong nonhomogeneous porous media was studied. The filtration equation with oscillated coefficients was used as a mathematical model. The asymptotic solution of the boundary problem describing the gas filtration in a strong nonhomogeneous porous medium was constructed and efficient coefficients of permeability were calculated. The example was considered. 
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     author = {V. G. Danilov and O. B. Rashkowsky},
     title = {The asymptotic solution of the equation describing the polytropic gas filtration in a~nonhomogeneous porous medium.~2},
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V. G. Danilov; O. B. Rashkowsky. The asymptotic solution of the equation describing the polytropic gas filtration in a~nonhomogeneous porous medium.~2. Matematičeskoe modelirovanie, Tome 3 (1991) no. 3, pp. 97-108. http://geodesic.mathdoc.fr/item/MM_1991_3_3_a10/