@article{DE_1993_29_6_a23,
     author = {A. V. Kagal and V. M. Filippov},
     title = {Some properties of the spaces $W^{(B_1,\dots,B_k)}(\Omega)$ with integro-differential characteristics},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1078--1081},
     publisher = {mathdoc},
     volume = {29},
     number = {6},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1993_29_6_a23/}
}