%0 Journal Article %A A. Alexiewicz %T On sequences of operations (IV) %J Studia Mathematica %D 1951 %P 93-101 %V 12 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-12-1-93-101/ %R 10.4064/sm-12-1-93-101 %G en %F 10_4064_sm_12_1_93_101