@article{10_4153_CMB_1991_067_5,
     author = {Vulakh, L. Ya.},
     title = {Classification of {Maximal} {Fuchsian} {Subsgroups} of {Some} {Bianchi} {Groups}},
     journal = {Canadian mathematical bulletin},
     pages = {417--422},
     year = {1991},
     volume = {34},
     number = {3},
     doi = {10.4153/CMB-1991-067-5},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1991-067-5/}
}