@article{JRAM_1989__399_153155,
     author = {Michel Laurent},
     title = {Rang p-adique d'unit\'es et action de groupes.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {81--108},
     year = {1989},
     volume = {399},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1989__399_153155/}
}