%0 Journal Article %A V. B. Andreev %T The convergence of difference schemes which approximate the second and third boundary value problems for elliptic equations %J Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki %D 1968 %P 1218-1231 %V 8 %N 6 %U http://geodesic.mathdoc.fr/item/ZVMMF_1968_8_6_a5/ %G ru %F ZVMMF_1968_8_6_a5