@article{JRAM_1993__442_153550,
     author = {G. W\"ustholz and A. Baker},
     title = {Logarithmic forms and group varieties.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {19--62},
     year = {1993},
     volume = {442},
     zbl = {0788.11026},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1993__442_153550/}
}