@article{DE_1971_7_9_a12,
     author = {E. I. Moiseev},
     title = {The {Neumann} problem for piece-wise smooth domains},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1655--1666},
     publisher = {mathdoc},
     volume = {7},
     number = {9},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_9_a12/}
}