@article{DE_1997_33_4_a14,
     author = {E. G. D'yakonov},
     title = {Reinforced {Sobolev} spaces and some new types of elliptic boundary value {problems.~I}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {532--539},
     publisher = {mathdoc},
     volume = {33},
     number = {4},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1997_33_4_a14/}
}