%0 Journal Article %A L. Ya. Pyanzina %T Approximation of the solutions of boundary-value problems for parabolic and hyperbolic equations by solutions of the Cauchy problem %J Doklady Akademii Nauk %D 1964 %P 1276-1279 %V 154 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1964_154_6_a8/ %G ru %F DAN_1964_154_6_a8