%0 Journal Article %A Hájek, Otomar %T Direct decompositions of lattices, I %J Czechoslovak Mathematical Journal %D 1957 %P 1-15 %V 7 %N 1 %U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1957.100225/ %R 10.21136/CMJ.1957.100225 %G en %F 10_21136_CMJ_1957_100225