@article{SM_1969_8_1_a4,
     author = {Yu. A. Dubinskii},
     title = {On~an~abstract theorem and its applications to boundary value problems for nonclassical equations},
     journal = {Sbornik. Mathematics},
     pages = {87--113},
     publisher = {mathdoc},
     volume = {8},
     number = {1},
     year = {1969},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1969_8_1_a4/}
}