@article{SF_1971__2_133826,
     author = {T. Tamura},
     title = {On commutative exclusive semigroups.},
     journal = {Semigroup forum},
     pages = {181--187},
     publisher = {mathdoc},
     volume = {2},
     year = {1971},
     zbl = {0226.20059},
     url = {http://geodesic.mathdoc.fr/item/SF_1971__2_133826/}
}