@article{JRAM_1976__0283_0284_151727,
     author = {P. Ribenboim},
     title = {Valuations and lengths of constructible modules.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {186--201},
     publisher = {mathdoc},
     volume = {0283_0284},
     year = {1976},
     zbl = {0327.13010},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1976__0283_0284_151727/}
}