Geodesic
A remark on the discrete spectrum of the automorphic Laplacian for a generalized cycloidal subgroup of the general Fuchsian group
Zapiski Nauchnykh Seminarov POMI, Analytical theory of numbers and theory of functions. Part 8, Tome 160 (1987), pp. 31-36 
A. B. Venkov. A remark on the discrete spectrum of the automorphic Laplacian for a generalized cycloidal subgroup of the general Fuchsian group. Zapiski Nauchnykh Seminarov POMI, Analytical theory of numbers and theory of functions. Part 8, Tome 160 (1987), pp. 31-36. http://geodesic.mathdoc.fr/item/ZNSL_1987_160_a2/
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     author = {A. B. Venkov},
     title = {A remark on the discrete spectrum of the automorphic {Laplacian} for a generalized cycloidal subgroup of the general {Fuchsian} group},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {31--36},
     year = {1987},
     volume = {160},
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     url = {http://geodesic.mathdoc.fr/item/ZNSL_1987_160_a2/}
}
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Voir la notice du chapitre de livre provenant de la source Math-Net.Ru

There is given a refinement of the Weyl–Selberg asymptotic formula in the spectral theory of automorphic functions in the situation of a generalized cycloidal Fuchsian group.