TY - JOUR AU - Zbigniew Słodkowski TI - A criterion for subharmonicity of a function of the spectrum JO - Studia Mathematica PY - 1982 SP - 37 EP - 49 VL - 75 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/sm-75-1-37-49/ DO - 10.4064/sm-75-1-37-49 LA - en ID - 10_4064_sm_75_1_37_49 ER -