%0 Journal Article %A N. L. Gol'dman %T Study of some mathematical models for nonstationary filtration processes %J Numerical methods and programming %D 2020 %P 1-12 %V 21 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/VMP_2020_21_1_a0/ %G ru %F VMP_2020_21_1_a0