%0 Journal Article %A I. B. Badriev %A O. V. Pankratova %T Mixed finite-element method for nonlinear stationary problems of seepage theory %J Issledovaniya po Prikladnoi Matematike i Informatike %D 1989 %P 17-34 %I mathdoc %U http://geodesic.mathdoc.fr/item/KUIPM_1989_a1/ %G ru %F KUIPM_1989_a1