@article{GDZPPN002298597,
title = {Higher Ramification Groups for Rank one Valuations},
journal = {Mathematische Annalen},
volume = {174},
year = {1967},
pages = {253-259},
zbl = {0166.04504},
url = {http://dml.mathdoc.fr/item/GDZPPN002298597}
}
Ribenboim, P. Higher Ramification Groups for Rank one Valuations. Mathematische Annalen, Tome 174 (1967) pp. 253-259. http://gdmltest.u-ga.fr/item/GDZPPN002298597/