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@article{10_4064_cm_31_1_11_20, author = {B. M. Schein}, title = {Function \ensuremath{\cup}-semigroups}, journal = {Colloquium Mathematicum}, pages = {11--20}, publisher = {mathdoc}, volume = {31}, number = {1}, year = {1974}, doi = {10.4064/cm-31-1-11-20}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-31-1-11-20/} }
B. M. Schein. Function ∪-semigroups. Colloquium Mathematicum, Tome 31 (1974) no. 1, pp. 11-20. doi : 10.4064/cm-31-1-11-20. http://geodesic.mathdoc.fr/articles/10.4064/cm-31-1-11-20/
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