@article{DAN_1971_197_4_a4,
     author = {E. A. Volkov},
     title = {A difference method of estimating errors in numerical solutions of boundary value problems for an ordinary differential equation},
     journal = {Doklady Akademii Nauk},
     pages = {758--761},
     publisher = {mathdoc},
     volume = {197},
     number = {4},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1971_197_4_a4/}
}