%0 Journal Article %A Kazuya Kato %A Takeshi Saito %T Ramification theory for varieties over a perfect field %J Annals of mathematics %D 2008 %P 33-96 %V 168 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4007/annals.2008.168.33/ %R 10.4007/annals.2008.168.33 %G en %F 10_4007_annals_2008_168_33