@article{RCM_2019_53_2_a7,
     author = {Christian Pommerenke and Margarita Toro},
     title = {On a family of groups generated by parabolic matrices},
     journal = {Revista colombiana de matematicas},
     pages = {221--236},
     publisher = {mathdoc},
     volume = {53},
     number = {2},
     year = {2019},
     url = {http://geodesic.mathdoc.fr/item/RCM_2019_53_2_a7/}
}