@article{CMUC_1978__19_2_a7,
     author = {Dost\'al, Zden\v{e}k},
     title = {The critical exponent of operators with constrained spectral radius},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {315--318},
     publisher = {mathdoc},
     volume = {19},
     number = {2},
     year = {1978},
     mrnumber = {500124},
     zbl = {0384.15013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1978__19_2_a7/}
}