@article{RCM_2011_45_1_a3,
     author = {On the Two-Parabolic Subgroups of SL(2},
     title = {C)},
     journal = {Revista colombiana de matematicas},
     pages = {37--50},
     publisher = {mathdoc},
     volume = {45},
     number = {1},
     year = {2011},
     url = {http://geodesic.mathdoc.fr/item/RCM_2011_45_1_a3/}
}