@article{MAT_1960_4_5_a7,
     author = {M. Schechter},
     title = {General boundary value problems for elliptic partial differential equations},
     journal = {Matematika},
     pages = {93--122},
     year = {1960},
     volume = {4},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MAT_1960_4_5_a7/}
}