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@article{DAN_1964_158_3_a12, author = {A. Yanushauskas}, title = {On the zeros of the gradient of a harmonic function}, journal = {Doklady Akademii Nauk}, pages = {547--549}, publisher = {mathdoc}, volume = {158}, number = {3}, year = {1964}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1964_158_3_a12/} }
A. Yanushauskas. On the zeros of the gradient of a harmonic function. Doklady Akademii Nauk, Tome 158 (1964) no. 3, pp. 547-549. http://geodesic.mathdoc.fr/item/DAN_1964_158_3_a12/