@article{CMH_1973__48_139554,
     author = {Abraham S.-T. Lue},
     title = {Connected {Algebras} and {Universal} {Covering}},
     journal = {Commentarii mathematici Helvetici},
     pages = {370--375},
     year = {1973},
     volume = {48},
     zbl = {0271.16015},
     url = {http://geodesic.mathdoc.fr/item/CMH_1973__48_139554/}
}