@article{MM2_1977__20_154435,
     author = {V. Pt\'ak and J. Zem\'anek},
     title = {On {Uniform} {Continuity} of the {Spectral} {Radius} in {Banach} {Algebras.}},
     journal = {Manuscripta mathematica},
     pages = {177--190},
     publisher = {mathdoc},
     volume = {20},
     year = {1977},
     zbl = {0347.46051},
     url = {http://geodesic.mathdoc.fr/item/MM2_1977__20_154435/}
}