@article{TM_1984_163_a8,
     author = {A. B. Venkov},
     title = {The automorphic scattering matrix for the {Hecke} group $\Gamma(2\cos\pi/q)$},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {32--36},
     publisher = {mathdoc},
     volume = {163},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1984_163_a8/}
}