%0 Journal Article %A Andrzej Nowicki %T Stiff derivations of commutative rings %J Colloquium Mathematicum %D 1984 %P 7-16 %V 48 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-48-1-7-16/ %R 10.4064/cm-48-1-7-16 %G en %F 10_4064_cm_48_1_7_16