@article{JRAM_1995__467_153756,
     author = {Jean Ludwig},
     title = {Dual topology of diamond groups.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {67--88},
     year = {1995},
     volume = {467},
     zbl = {0833.22011},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1995__467_153756/}
}