@misc{RCM_2010_44_1_a5,
     title = {Maximal {Virtual} {Schottky} {Groups:} {Explicit} {Constructions}},
     journal = {Revista colombiana de matematicas},
     pages = {41--57},
     publisher = {mathdoc},
     volume = {44},
     number = {1},
     year = {2010},
     url = {http://geodesic.mathdoc.fr/item/RCM_2010_44_1_a5/}
}