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@article{SF_1989__39_2_134987, author = {E.E. DeVun and G. Graham}, title = {Semigroups with commuting threads.}, journal = {Semigroup forum}, pages = {203--214}, publisher = {mathdoc}, volume = {39}, number = {2}, year = {1989}, zbl = {0672.22007}, url = {http://geodesic.mathdoc.fr/item/SF_1989__39_2_134987/} }
E.E. DeVun; G. Graham. Semigroups with commuting threads.. Semigroup forum, Tome 39 (1989) no. 2, pp. 203-214. http://geodesic.mathdoc.fr/item/SF_1989__39_2_134987/