@article{ZNSL_1986_149_a18,
     author = {N. A. Shirokov},
     title = {A~note on {Puchsian} groups},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {181--185},
     year = {1986},
     volume = {149},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1986_149_a18/}
}