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@article{DE_1975_11_1_a8, author = {V. M. Isakov}, title = {Inverse theorems on the smoothness of potentials}, journal = {Differencialʹnye uravneni\^a}, pages = {66--74}, publisher = {mathdoc}, volume = {11}, number = {1}, year = {1975}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1975_11_1_a8/} }
V. M. Isakov. Inverse theorems on the smoothness of potentials. Differencialʹnye uravneniâ, Tome 11 (1975) no. 1, pp. 66-74. http://geodesic.mathdoc.fr/item/DE_1975_11_1_a8/