@article{10_4064_fm_56_1_21_33,
     author = {R. Dickamn and R. Kelley and Leonard Rubin and P. Swingle},
     title = {Semigroups and clusters of indecomposability},
     journal = {Fundamenta Mathematicae},
     pages = {21--33},
     publisher = {mathdoc},
     volume = {56},
     number = {1},
     year = {1964},
     doi = {10.4064/fm-56-1-21-33},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-56-1-21-33/}
}