@article{GDZPPN002383667, title = {Generalized "Boolean" theory of universal algebras. Part I.}, journal = {Mathematische Zeitschrift}, volume = {59}, year = {1953}, pages = {306-336}, zbl = {0051.02201}, url = {http://dml.mathdoc.fr/item/GDZPPN002383667} }
Foster, Alfred L. Generalized "Boolean" theory of universal algebras. Part I.. Mathematische Zeitschrift, Tome 59 (1953) pp. 306-336. http://gdmltest.u-ga.fr/item/GDZPPN002383667/