TY - JOUR AU - Andrzej Nowicki TI - Stiff derivations of commutative rings JO - Colloquium Mathematicum PY - 1984 SP - 7 EP - 16 VL - 48 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/cm-48-1-7-16/ DO - 10.4064/cm-48-1-7-16 LA - en ID - 10_4064_cm_48_1_7_16 ER -