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@article{SF_1989__38_2_134942, author = {Edward J. Tully}, title = {Expletives in languages and middle units in semigroups.}, journal = {Semigroup forum}, pages = {77--84}, publisher = {mathdoc}, volume = {38}, number = {2}, year = {1989}, zbl = {0662.20043}, url = {http://geodesic.mathdoc.fr/item/SF_1989__38_2_134942/} }
Edward J. Tully. Expletives in languages and middle units in semigroups.. Semigroup forum, Tome 38 (1989) no. 2, pp. 77-84. http://geodesic.mathdoc.fr/item/SF_1989__38_2_134942/