%0 Journal Article %A Raymond Balbes %T On free pseudo-complemented and relatively pseudo-complemented semi-lattices %J Fundamenta Mathematicae %D 1973 %P 119-131 %V 78 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-78-2-119-131/ %R 10.4064/fm-78-2-119-131 %G en %F 10_4064_fm_78_2_119_131