@article{MS2_1973__33_166328,
     author = {Troels Jorgensen},
     title = {On {Cyclic} {Groups} of {M\"obius} {Transformations.}},
     journal = {Mathematica Scandinavica},
     pages = {250--260},
     publisher = {mathdoc},
     volume = {33},
     year = {1973},
     zbl = {0286.30017},
     url = {http://geodesic.mathdoc.fr/item/MS2_1973__33_166328/}
}