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@article{MZ_1964__83_170222, author = {Alfred L. Foster and Alden Pixley}, title = {Semi-categorical algebras. {I.} {Semi-primal} algebras.}, journal = {Mathematische Zeitschrift}, pages = {147--169}, publisher = {mathdoc}, volume = {83}, year = {1964}, zbl = {0117.26001}, url = {http://geodesic.mathdoc.fr/item/MZ_1964__83_170222/} }
Alfred L. Foster; Alden Pixley. Semi-categorical algebras. I. Semi-primal algebras.. Mathematische Zeitschrift, Tome 83 (1964), pp. 147-169. http://geodesic.mathdoc.fr/item/MZ_1964__83_170222/