@article{KYB_2004_40_4_a3,
     author = {Rie\v{c}anov\'a, Zdenka},
     title = {Modular atomic effect algebras and the existence of subadditive states},
     journal = {Kybernetika},
     pages = {459--468},
     year = {2004},
     volume = {40},
     number = {4},
     mrnumber = {2102364},
     zbl = {1249.03120},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KYB_2004_40_4_a3/}
}