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@article{SF_1980__20_134427, author = {P.R. Jones}, title = {The {Hopf} property and {K-free} products of semigroups.}, journal = {Semigroup forum}, pages = {343--368}, publisher = {mathdoc}, volume = {20}, year = {1980}, zbl = {0448.20055}, url = {http://geodesic.mathdoc.fr/item/SF_1980__20_134427/} }
P.R. Jones. The Hopf property and K-free products of semigroups.. Semigroup forum, Tome 20 (1980), pp. 343-368. http://geodesic.mathdoc.fr/item/SF_1980__20_134427/