Geodesic
On the spectrum of the Laplace--Beltrami operator for congruence subgroups of the modular group
Algebra i analiz, Tome 23 (2011) no. 4, pp. 31-39.

Voir la notice de l'article provenant de la source Math-Net.Ru

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     title = {On the spectrum of the {Laplace--Beltrami} operator for congruence subgroups of the modular group},
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V. V. Golovchanskii; M. N. Smotrov. On the spectrum of the Laplace--Beltrami operator for congruence subgroups of the modular group. Algebra i analiz, Tome 23 (2011) no. 4, pp. 31-39. http://geodesic.mathdoc.fr/item/AA_2011_23_4_a1/

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