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@article{SF_1984__29_134684, author = {F. Otto}, title = {Conjugacy in monoids.}, journal = {Semigroup forum}, pages = {223--240}, publisher = {mathdoc}, volume = {29}, year = {1984}, zbl = {0551.20044}, url = {http://geodesic.mathdoc.fr/item/SF_1984__29_134684/} }
F. Otto. Conjugacy in monoids.. Semigroup forum, Tome 29 (1984), pp. 223-240. http://geodesic.mathdoc.fr/item/SF_1984__29_134684/