%0 Journal Article %A Pondělíček, Bedřich %T Direct decomposability of tolerances and congruences on semigroups %J Czechoslovak Mathematical Journal %D 1988 %P 701-704 %V 38 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1988.102265/ %R 10.21136/CMJ.1988.102265 %G en %F 10_21136_CMJ_1988_102265