Geodesic
Biharmonic functions, nonnegative in a~half-strip
Matematičeskie zametki, Tome 15 (1974) no. 1, pp. 121-128.

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It is proved that a function which is biharmonic in a half-strip and satisfies homogeneous Dirichlet conditions at the base of the strip oscillates. 
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     title = {Biharmonic functions, nonnegative in a~half-strip},
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V. A. Kondratiev; S. D. Èidel'man. Biharmonic functions, nonnegative in a~half-strip. Matematičeskie zametki, Tome 15 (1974) no. 1, pp. 121-128. http://geodesic.mathdoc.fr/item/MZM_1974_15_1_a12/