%0 Journal Article %A Müller, Vladimír %T On discontinuity of the spectral radius in Banach algebras %J Commentationes Mathematicae Universitatis Carolinae %D 1977 %P 591-598 %V 18 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMUC_1977__18_3_a16/ %G en %F CMUC_1977__18_3_a16