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@article{SF_1974__8_134051, author = {Thomas Nordahl}, title = {Semigroups satisfying (xy)m = xmym .}, journal = {Semigroup forum}, pages = {332--346}, publisher = {mathdoc}, volume = {8}, year = {1974}, zbl = {0298.20049}, url = {http://geodesic.mathdoc.fr/item/SF_1974__8_134051/} }
Thomas Nordahl. Semigroups satisfying (xy)m = xmym .. Semigroup forum, Tome 8 (1974), pp. 332-346. http://geodesic.mathdoc.fr/item/SF_1974__8_134051/