Geodesic
Multiplicities of Singularities of Eigenfunctions for the Laplace–Beltrami Operator
Funkcionalʹnyj analiz i ego priloženiâ, Tome 29 (1995) no. 1, pp. 80-82 Cet article a éte moissonné depuis la source Math-Net.Ru

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     title = {Multiplicities of {Singularities} of {Eigenfunctions} for the {Laplace{\textendash}Beltrami} {Operator}},
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V. N. Karpushkin. Multiplicities of Singularities of Eigenfunctions for the Laplace–Beltrami Operator. Funkcionalʹnyj analiz i ego priloženiâ, Tome 29 (1995) no. 1, pp. 80-82. http://geodesic.mathdoc.fr/item/FAA_1995_29_1_a7/

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[4] Dong R.-T., Nodal Sets of Eigenfunctions on Riemann Surfaces, Mathematical Sciences Research Institute, Barkeley, California, MSRI 04527-91