Geodesic
Existence of limit values of the solutions of a polyharmonic equation on the boundary of a domain
Sbornik. Mathematics, Tome 187 (1996) no. 11, pp. 1665-1690 
V. P. Mikhailov. Existence of limit values of the solutions of a polyharmonic equation on the boundary of a domain. Sbornik. Mathematics, Tome 187 (1996) no. 11, pp. 1665-1690. http://geodesic.mathdoc.fr/item/SM_1996_187_11_a3/
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Voir la notice de l'article provenant de la source Math-Net.Ru

Necessary and sufficient conditions for the existence of limits in the mean of functions polyharmonic in a disc are found.

[1] Roitberg Ya. A., “O granichnykh znacheniyakh obobschennykh reshenii ellipticheskikh uravnenii”, DAN SSSR, 188:1 (1969), 41–44 | MR | Zbl

[2] Muskhelishvili N. I., Nekotorye osnovnye zadachi matematicheskoi teorii uprugosti, Nauka, M., 1966