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@article{10_4064_cm_8_2_223_224, author = {A. Wallace}, title = {Problems on semigroups}, journal = {Colloquium Mathematicum}, pages = {223--224}, publisher = {mathdoc}, volume = {8}, number = {2}, year = {1961}, doi = {10.4064/cm-8-2-223-224}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-8-2-223-224/} }
A. Wallace. Problems on semigroups. Colloquium Mathematicum, Tome 8 (1961) no. 2, pp. 223-224. doi : 10.4064/cm-8-2-223-224. http://geodesic.mathdoc.fr/articles/10.4064/cm-8-2-223-224/
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