@article{DE_1983_19_6_a14,
     author = {U. Raitums},
     title = {Questions of the existence of a solution in problems of optimal control of leading coefficients of linear elliptic equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1040--1047},
     publisher = {mathdoc},
     volume = {19},
     number = {6},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1983_19_6_a14/}
}