%0 Journal Article %A A. E. Radwan %T Filtered and graded Procesi extensions of rings %J Algebra and discrete mathematics %D 2007 %P 131-137 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/ADM_2007_4_a11/ %G en %F ADM_2007_4_a11