@article{MZ_1982__180_173187,
     author = {Tosio Kato},
     title = {Superconvexity of the {Spectral} {Radius,} and {Convexity} of the {Spectral} {Bound} and the {Type.}},
     journal = {Mathematische Zeitschrift},
     pages = {265--274},
     publisher = {mathdoc},
     volume = {180},
     year = {1982},
     zbl = {0471.46012},
     url = {http://geodesic.mathdoc.fr/item/MZ_1982__180_173187/}
}