Geodesic
Biharmonic functions, nonnegative in a half-strip
Matematičeskie zametki, Tome 15 (1974) no. 1, pp. 121-128 
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/
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     author = {V. A. Kondratiev and S. D. \`Eidel'man},
     title = {Biharmonic functions, nonnegative in a~half-strip},
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     pages = {121--128},
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Voir la notice de l'article provenant de la source Math-Net.Ru

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.