%0 Journal Article %A Abraham Goetz %T On the algebraic structure of the process of forming subsequences %J Colloquium Mathematicum %D 1972 %P 313-322 %V 26 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-26-1-313-322/ %R 10.4064/cm-26-1-313-322 %G en %F 10_4064_cm_26_1_313_322