%0 Journal Article %A Klaus Thomsen %T Invariant states for positive operator semigroups %J Studia Mathematica %D 1985 %P 287-291 %V 81 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-81-3-287-291/ %R 10.4064/sm-81-3-287-291 %G en %F 10_4064_sm_81_3_287_291