Geodesic
On uniqueness theorems for harmonic functions in a cylinder
Izvestiya. Mathematics, Tome 1 (1967) no. 2, pp. 341-347 
V. P. Gromov. On uniqueness theorems for harmonic functions in a cylinder. Izvestiya. Mathematics, Tome 1 (1967) no. 2, pp. 341-347. http://geodesic.mathdoc.fr/item/IM2_1967_1_2_a8/
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     author = {V. P. Gromov},
     title = {On uniqueness theorems for harmonic functions in a cylinder},
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     volume = {1},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1967_1_2_a8/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

Harmonic functions $U(r,\varphi,x)$ in an infinite cylinder $Q$ are considered herein. Conditions are given under which it follows that $U(r,\varphi,x)\equiv0$ from the boundedness of the normal derivative of the function $U(r,\varphi,x)$ on parallel sections of the cylinder $Q$.

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