%0 Journal Article %A Riečanová, Zdenka %T Modular atomic effect algebras and the existence of subadditive states %J Kybernetika %D 2004 %P [459] %V 40 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/KYB_2004__40_4_a3/ %G en %F KYB_2004__40_4_a3