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@article{10_21136_CMJ_1970_100982, author = {D'Alarcao, Hugo}, title = {Biregular semigroups. {I}}, journal = {Czechoslovak Mathematical Journal}, pages = {544--548}, publisher = {mathdoc}, volume = {20}, number = {4}, year = {1970}, doi = {10.21136/CMJ.1970.100982}, mrnumber = {0268300}, zbl = {0223.20071}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1970.100982/} }
D'Alarcao, Hugo. Biregular semigroups. I. Czechoslovak Mathematical Journal, Tome 20 (1970) no. 4, pp. 544-548. doi : 10.21136/CMJ.1970.100982. http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1970.100982/
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