@article{10_4064_cm_47_1_97_100,
     author = {Vern Paulsen},
     title = {The group of invertible elements in a {Banach} algebra},
     journal = {Colloquium Mathematicum},
     pages = {97--100},
     publisher = {mathdoc},
     volume = {47},
     number = {1},
     year = {1982},
     doi = {10.4064/cm-47-1-97-100},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-47-1-97-100/}
}