Geodesic
Estimates exact in a closed domain of the eigenfunctions of the polyharmonic operator
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 25 (1970) no. 1 
I. A. Shishmarev. Estimates exact in a closed domain of the eigenfunctions of the polyharmonic operator. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 25 (1970) no. 1. http://geodesic.mathdoc.fr/item/RM_1970_25_1_a12/
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Voir la notice de l'article provenant de la source Math-Net.Ru

[1] D. M. Eidus, “Nekotorye neravenstva dlya sobstvennykh funktsii”, DAN, 107:6 (1956) | MR

[2] I. A. Shishmarev, “Teorema o srednem dlya poligarmonicheskogo uravneniya i ee sledstviya”, Funkts. anal., 3:4 (1969), 69–76 | MR | Zbl

[3] V. A. Ilin, I. A. Shishmarev, “O tochnykh otsenkakh sobstvennykh funktsii v zamknutoi oblasti”, Trudy Sovetsko-amerikanskogo simpoziuma, Novosibirsk, 1963

[4] I. A. Shishmarev, “O tochnykh otsenkakh sobstvennykh funktsii bigarmonicheskogo operatora”, DAN, 170:4 (1966) | Zbl

[5] I. A. Shishmarev, “Tochnye v zamknutoi oblasti otsenki sobstvennykh funktsii operatora Laplasa i ikh proizvodnykh”, Matem. zametki, 1970