@article{MS2_1993__72_1_167247,
     author = {Mika Sepp\"al\"a and Tuomas Sorvali},
     title = {Leftings of {M\"obius} groups to matrix groups.},
     journal = {Mathematica Scandinavica},
     pages = {223--234},
     publisher = {mathdoc},
     volume = {72},
     number = {1},
     year = {1993},
     zbl = {0797.30034},
     url = {http://geodesic.mathdoc.fr/item/MS2_1993__72_1_167247/}
}