@article{VMUMM_1983_2_a10,
     author = {V. P. Smolich},
     title = {The spectrum of the perturbed {Laplace} operator on the fundamental domain of a discrete group on the {Lobachevskii} plane},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {49--53},
     publisher = {mathdoc},
     number = {2},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1983_2_a10/}
}