%0 Journal Article %A Zbigniew Słodkowski %T A criterion for subharmonicity of a function of the spectrum %J Studia Mathematica %D 1982 %P 37-49 %V 75 %N 1 %U http://geodesic.mathdoc.fr/articles/10.4064/sm-75-1-37-49/ %R 10.4064/sm-75-1-37-49 %G en %F 10_4064_sm_75_1_37_49