%0 Journal Article %A R. Dickamn %A R. Kelley %A Leonard Rubin %A P. Swingle %T Semigroups and clusters of indecomposability %J Fundamenta Mathematicae %D 1964 %P 21-33 %V 56 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-56-1-21-33/ %R 10.4064/fm-56-1-21-33 %G en %F 10_4064_fm_56_1_21_33