@article{10_4153_CMB_2006_011_6,
     author = {Ledet, Arne},
     title = {PSL(2, 2n {)-Extensions} {Over}},
     journal = {Canadian mathematical bulletin},
     pages = {113--116},
     year = {2006},
     volume = {49},
     number = {1},
     doi = {10.4153/CMB-2006-011-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2006-011-6/}
}