%0 Journal Article %A S. Yu. Dobrokhotov %A A. I. Shafarevich %T Tunnel Splitting of the Spectrum of the Beltrami–Laplace Operators on Two-Dimensional Surfaces with Square Integrable Geodesic Flow %J Funkcionalʹnyj analiz i ego priloženiâ %D 2000 %P 67-69 %V 34 %N 2 %U http://geodesic.mathdoc.fr/item/FAA_2000_34_2_a7/ %G ru %F FAA_2000_34_2_a7