@article{DE_1990_26_4_a11,
     author = {O. D. Dyachkin},
     title = {Some parabolic and elliptic equations in a {Hilbert} space},
     journal = {Differencialʹnye uravneni\^a},
     pages = {640--652},
     publisher = {mathdoc},
     volume = {26},
     number = {4},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1990_26_4_a11/}
}