@article{MZ_1957__68_169689,
     author = {P. Ribenboim},
     title = {Le th\'eor\`eme d' approximation pour les valuations de {Krull.}},
     journal = {Mathematische Zeitschrift},
     pages = {1--18},
     publisher = {mathdoc},
     volume = {68},
     year = {1957},
     zbl = {0102.03002},
     url = {http://geodesic.mathdoc.fr/item/MZ_1957__68_169689/}
}