Geodesic
The asymptotic solution of the equation describing the polytropic gas filtration in a~nonhomogeneous porous medium.~2
Matematičeskoe modelirovanie, Tome 3 (1991) no. 2, pp. 119-134.

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The asymptotic solution of the singulary perturbed boundary problem of degenerate parabolic equation describing the nonstationary polytropic gas filtration in a nonhomogeneous porous medium was constructed. The estimation of difference between the exact and asymptotic solution was given. It enables to verify the asymptotic solution. 
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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. 2, pp. 119-134. http://geodesic.mathdoc.fr/item/MM_1991_3_2_a8/