%0 Journal Article %A Ramana Murty, P.V. %A Raman, V. %T Permutability of distributive congruence relations in a joint semilattice directed below %J Mathematica slovaca %D 1985 %P 43-49 %V 35 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/MASLO_1985__35_1_a5/ %G en %F MASLO_1985__35_1_a5