@article{GDZPPN00229298X, title = {Independence in the Small among Universal Algebras.}, journal = {Mathematische Annalen}, volume = {154}, year = {1964}, pages = {273-284}, url = {http://dml.mathdoc.fr/item/GDZPPN00229298X} }
O'KEEFE, E.S. Independence in the Small among Universal Algebras.. Mathematische Annalen, Tome 154 (1964) pp. 273-284. http://gdmltest.u-ga.fr/item/GDZPPN00229298X/