@article{MM2_1989__64_2_155401,
     author = {Mika Sepp\"al\"a and Tuomas Sorvali},
     title = {Parametrization of reflection groups acting in a disk.},
     journal = {Manuscripta mathematica},
     pages = {135--154},
     publisher = {mathdoc},
     volume = {64},
     number = {2},
     year = {1989},
     zbl = {0683.30037},
     url = {http://geodesic.mathdoc.fr/item/MM2_1989__64_2_155401/}
}