@article{01893530,
title = {Lifting M\"obius groups.},
journal = {The New York Journal of Mathematics [electronic only]},
volume = {8},
year = {2002},
pages = {181-188},
zbl = {1066.30038},
language = {en},
url = {http://dml.mathdoc.fr/item/01893530}
}
Button, J. O. Lifting Möbius groups.. The New York Journal of Mathematics [electronic only], Tome 8 (2002) pp. 181-188. http://gdmltest.u-ga.fr/item/01893530/