TY - JOUR AU - Drensky, Vesselin TI - Invariants of Unipotent Transformations Acting on Noetherian Relatively Free Algebras JO - Serdica Mathematical Journal PY - 2004 SP - 395 EP - 404 VL - 30 IS - 2-3 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/SMJ2_2004_30_2-3_a14/ LA - en ID - SMJ2_2004_30_2-3_a14 ER -