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@article{MZ_1975__143_172213, author = {Armin Frei and Peter Hilton and A. Deleanu}, title = {Idempotent {Triples} and {Completion.}}, journal = {Mathematische Zeitschrift}, pages = {91--104}, publisher = {mathdoc}, volume = {143}, year = {1975}, zbl = {0295.18001}, url = {http://geodesic.mathdoc.fr/item/MZ_1975__143_172213/} }
Armin Frei; Peter Hilton; A. Deleanu. Idempotent Triples and Completion.. Mathematische Zeitschrift, Tome 143 (1975), pp. 91-104. http://geodesic.mathdoc.fr/item/MZ_1975__143_172213/