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@article{DAN_1965_160_5_a15, author = {A. B. Shabat}, title = {The removability of level sets for solutions to elliptic equations}, journal = {Doklady Akademii Nauk}, pages = {1032--1035}, publisher = {mathdoc}, volume = {160}, number = {5}, year = {1965}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1965_160_5_a15/} }
A. B. Shabat. The removability of level sets for solutions to elliptic equations. Doklady Akademii Nauk, Tome 160 (1965) no. 5, pp. 1032-1035. http://geodesic.mathdoc.fr/item/DAN_1965_160_5_a15/