@article{DE_1975_11_8_a1,
     author = {A. Ya. Lepin and V. D. Ponomarev},
     title = {Local uniqueness and existence of the solution of boundary value problems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1361--1365},
     publisher = {mathdoc},
     volume = {11},
     number = {8},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1975_11_8_a1/}
}