%0 Journal Article %A Chajda, Ivan %A Zelinka, Bohdan %T Directly decomposable tolerances on direct products of lattices and semilattices %J Czechoslovak Mathematical Journal %D 1983 %P 519-521 %V 33 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1983.101907/ %R 10.21136/CMJ.1983.101907 %G en %F 10_21136_CMJ_1983_101907