%0 Journal Article %A Dostál, Zdeněk %T The critical exponent of operators with constrained spectral radius %J Commentationes Mathematicae Universitatis Carolinae %D 1978 %P 315-318 %V 19 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMUC_1978__19_2_a7/ %G en %F CMUC_1978__19_2_a7