@article{GDZPPN002406543, title = {Primal Extensions of Universal Algebras.}, journal = {Mathematische Zeitschrift}, volume = {114}, year = {1970}, pages = {53-57}, zbl = {0182.34302}, url = {http://dml.mathdoc.fr/item/GDZPPN002406543} }
Knoebel, R. Arthur. Primal Extensions of Universal Algebras.. Mathematische Zeitschrift, Tome 114 (1970) pp. 53-57. http://gdmltest.u-ga.fr/item/GDZPPN002406543/