@article{GDZPPN002061082, title = {Connected Algebras and Universal Covering}, journal = {Commentarii mathematici Helvetici}, volume = {48}, year = {1973}, pages = {370-375}, zbl = {0271.16015}, url = {http://dml.mathdoc.fr/item/GDZPPN002061082} }
Lue, Abraham S.-T. Connected Algebras and Universal Covering. Commentarii mathematici Helvetici, Tome 48 (1973) pp. 370-375. http://gdmltest.u-ga.fr/item/GDZPPN002061082/