%0 Journal Article %A Jerzy Płonka %T On connections between the decomposition of an algebra into sums of direct systems of subalgebras %J Fundamenta Mathematicae %D 1974 %P 237-244 %V 84 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-84-3-237-244/ %R 10.4064/fm-84-3-237-244 %G en %F 10_4064_fm_84_3_237_244