@article{DAN_1968_179_2_a3,
     author = {I. V. Gel'man},
     title = {Stability of abstract boundary value problems in a bounded region under weak perturbations of boundary operators},
     journal = {Doklady Akademii Nauk},
     pages = {264--266},
     publisher = {mathdoc},
     volume = {179},
     number = {2},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1968_179_2_a3/}
}