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@article{10_4064_cm_34_1_7_16, author = {Donald Marxen}, title = {The topology of the free topological semigroup}, journal = {Colloquium Mathematicum}, pages = {7--16}, publisher = {mathdoc}, volume = {34}, number = {1}, year = {1975}, doi = {10.4064/cm-34-1-7-16}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-34-1-7-16/} }
Donald Marxen. The topology of the free topological semigroup. Colloquium Mathematicum, Tome 34 (1975) no. 1, pp. 7-16. doi : 10.4064/cm-34-1-7-16. http://geodesic.mathdoc.fr/articles/10.4064/cm-34-1-7-16/
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