@article{CMUC_1976__17_4_a6,
     author = {Zem\'anek, Jaroslav},
     title = {Concerning spectral characterizations of the radical in {Banach} algebras},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {689--691},
     publisher = {mathdoc},
     volume = {17},
     number = {4},
     year = {1976},
     mrnumber = {0428040},
     zbl = {0337.46043},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1976__17_4_a6/}
}