@article{DE_1980_16_3_a13,
     author = {U. Raitums},
     title = {Closure in $L_2$ of the set of solutions of a family of nonlinear elliptic equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {501--506},
     publisher = {mathdoc},
     volume = {16},
     number = {3},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1980_16_3_a13/}
}