@article{CMH_1967__42_139334,
     author = {Albert Marden},
     title = {On {Finitely} {Generated} {Fuchsian} {Groups.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {81--85},
     publisher = {mathdoc},
     volume = {42},
     year = {1967},
     zbl = {0156.30703},
     url = {http://geodesic.mathdoc.fr/item/CMH_1967__42_139334/}
}