@article{DE_1984_20_9_a2,
     author = {D. G. Bitsadze and I. T. Kiguradze},
     title = {Stability of the solution set of nonlinear boundary value problems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1495--1501},
     publisher = {mathdoc},
     volume = {20},
     number = {9},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1984_20_9_a2/}
}