Geodesic
Multiplicities of Singularities of Eigenfunctions for the Laplace--Beltrami Operator
Funkcionalʹnyj analiz i ego priloženiâ, Tome 29 (1995) no. 1, pp. 80-82.

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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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[2] Dubrovin B. A., Novikov S. P., Fomenko A. T., Sovremennaya geometriya, Nauka, M., 1979 | MR

[3] Karpushkin V. N., “O topologii nulei sobstvennykh funktsii”, Funkts. analiz i pril., 23:3 (1989), 59–60 | MR

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