%0 Journal Article %A Drensky, Vesselin %T Invariants of Unipotent Transformations Acting on Noetherian Relatively Free Algebras %J Serdica Mathematical Journal %D 2004 %P 395-404 %V 30 %N 2-3 %I mathdoc %U http://geodesic.mathdoc.fr/item/SMJ2_2004_30_2-3_a14/ %G en %F SMJ2_2004_30_2-3_a14