%0 Journal Article %A L. M. Kotlyar %A È. V. Skvortsov %T Exact solutions of two-dimensional problems of the steady filtration of a viscoplastic liquid with a variable initial gradient %J Doklady Akademii Nauk %D 1976 %P 545-548 %V 230 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1976_230_3_a11/ %G ru %F DAN_1976_230_3_a11