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@article{DE_1982_18_6_a13, author = {V. G. Litvinov}, title = {Optimal control of coefficients in elliptic systems}, journal = {Differencialʹnye uravneni\^a}, pages = {1036--1047}, publisher = {mathdoc}, volume = {18}, number = {6}, year = {1982}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1982_18_6_a13/} }
V. G. Litvinov. Optimal control of coefficients in elliptic systems. Differencialʹnye uravneniâ, Tome 18 (1982) no. 6, pp. 1036-1047. http://geodesic.mathdoc.fr/item/DE_1982_18_6_a13/