@article{ZNSL_1987_160_a2,
     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},
     publisher = {mathdoc},
     volume = {160},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1987_160_a2/}
}