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@article{BUMI_1966_3_21_2_a3, author = {Dawson, David F.}, title = {On subgroups of semigroups.}, journal = {Bollettino della Unione matematica italiana}, pages = {144--146}, publisher = {mathdoc}, volume = {Ser. 3, 21}, number = {2}, year = {1966}, zbl = {0143.03003}, mrnumber = {202872}, language = {en}, url = {http://geodesic.mathdoc.fr/item/BUMI_1966_3_21_2_a3/} }
Dawson, David F. On subgroups of semigroups.. Bollettino della Unione matematica italiana, Série 3, Tome 21 (1966) no. 2, pp. 144-146. http://geodesic.mathdoc.fr/item/BUMI_1966_3_21_2_a3/
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