@article{ZVMMF_1987_27_10_a4,
     author = {K. Balla},
     title = {Error estimate for an approximate solution of certain singular ordinary differential equations},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {1489--1503},
     publisher = {mathdoc},
     volume = {27},
     number = {10},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1987_27_10_a4/}
}