%0 Journal Article %A Skula, Ladislav %T Prime elements in the semigroup of finite types of partially ordered sets in cardinal multiplication %J Archivum mathematicum %D 1968 %P 97-101 %V 04 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/ARM_1968__4_2_a2/ %G en %F ARM_1968__4_2_a2