%0 Journal Article %A Ulrich Abel %T An identity for formal derivatives in a commutative algebra %J Annales Polonici Mathematici %D 2017 %P 195-202 %V 119 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap170324-11-9/ %R 10.4064/ap170324-11-9 %G en %F 10_4064_ap170324_11_9