TY - JOUR IS - 1-4 N1 - Bibliogr.: 287. p. Y1 - 1993/// SN - 0001-6969 SP - 277 KW - Matematika A1 - Voiculescu Dan ID - acta15384 JF - Acta scientiarum mathematicarum UR - http://www.acta.hu VL - 57 TI - A note on the augmentation ideal of certain rings associated with free groups EP - 287 AV - restricted ER -