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