%0 Journal Article %A Krzysztof Jan Nowak %T A proof of the valuation property and preparation theorem %J Annales Polonici Mathematici %D 2007 %P 75-85 %V 92 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap92-1-8/ %R 10.4064/ap92-1-8 %G en %F 10_4064_ap92_1_8