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@article{MZ_1968__108_171086, author = {A. Almeida Costa}, title = {Sur les {\textmu}-demi-anneaux.}, journal = {Mathematische Zeitschrift}, pages = {10--14}, publisher = {mathdoc}, volume = {108}, year = {1968}, zbl = {0167.30501}, url = {http://geodesic.mathdoc.fr/item/MZ_1968__108_171086/} }
A. Almeida Costa. Sur les µ-demi-anneaux.. Mathematische Zeitschrift, Tome 108 (1968), pp. 10-14. http://geodesic.mathdoc.fr/item/MZ_1968__108_171086/