@article{TSG_1989-1990__8__19_0,
     author = {Dal'bo, Fran\c{c}oise},
     title = {Des groupes magiques ou quand des sous-groupes libres affines op\`erent proprement discontin\^ument sur $\mathbf {R}^3$},
     journal = {S\'eminaire de th\'eorie spectrale et g\'eom\'etrie},
     pages = {19--26},
     publisher = {Institut Fourier},
     address = {Grenoble},
     volume = {8},
     year = {1989-1990},
     mrnumber = {1717280},
     zbl = {0821.20023},
     language = {fr},
     url = {http://www.numdam.org/item/TSG_1989-1990__8__19_0/}
}