@article{10_4153_CJM_1991_009_1,
     author = {Maclachlan, C. and Reid, A. W.},
     title = {Parametrizing {Fuchsian} {Subgroups} of the {Bianchi} {Groups}},
     journal = {Canadian journal of mathematics},
     pages = {158--181},
     year = {1991},
     volume = {43},
     number = {1},
     doi = {10.4153/CJM-1991-009-1},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1991-009-1/}
}