Geodesic
On the zeros of eigenfunctions
Funkcionalʹnyj analiz i ego priloženiâ, Tome 6 (1972) no. 3, pp. 72-73 
E. A. Dain. On the zeros of eigenfunctions. Funkcionalʹnyj analiz i ego priloženiâ, Tome 6 (1972) no. 3, pp. 72-73. http://geodesic.mathdoc.fr/item/FAA_1972_6_3_a13/
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Voir la notice de l'article provenant de la source Math-Net.Ru

[1] Kondratev V.A., Eidelman S.D., Matem. zametki, 9:1 (1971), 83–87 | MR

[2] Kollatts L., Zadachi na sobstvennye znacheniya, Nauka, M., 1968

[3] Vishik M.I. i Lyusternik L.A., UMN, XII:5 (1957), 3–122 | MR