%0 Journal Article %A Galli, A. %A Sagastume, M. %T A subdirectly irreducible symmetric Heyting algebra which is not simple. %J Portugaliae mathematica %D 1994 %P 141-146 %V 51 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/PORMA_1994__51_1_47027/ %G en %F PORMA_1994__51_1_47027