%0 Journal Article %A D. S. Dzhumabaev %T Singular boundary-value problems and their approximation for nonlinear ordinary differential equations %J Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki %D 1992 %P 13-29 %V 32 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/ZVMMF_1992_32_1_a1/ %G ru %F ZVMMF_1992_32_1_a1