@article{DE_1972_8_4_a1,
     author = {A. B. Vasil'eva},
     title = {The influence of local perturbations on the solution of a boundary value problem},
     journal = {Differencialʹnye uravneni\^a},
     pages = {581--589},
     publisher = {mathdoc},
     volume = {8},
     number = {4},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1972_8_4_a1/}
}