@article{DAN_1991_318_5_a1,
     author = {M. E. Bogovskii and V. N. Maslennikova and Zh. A. U\`erdian},
     title = {A boundary value problem with discontinuous boundary conditions in},
     journal = {Doklady Akademii Nauk},
     pages = {1037--1041},
     publisher = {mathdoc},
     volume = {318},
     number = {5},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_318_5_a1/}
}