Geodesic
On uniqueness theorems for harmonic functions in a cylinder
Izvestiya. Mathematics , Tome 1 (1967) no. 2, pp. 341-347.

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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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     title = {On uniqueness theorems for harmonic functions in a cylinder},
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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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