%0 Journal Article %A G. Grätzer %T A reduced free product of lattices %J Fundamenta Mathematicae %D 1971 %P 21-27 %V 73 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-73-1-21-27/ %R 10.4064/fm-73-1-21-27 %G en %F 10_4064_fm_73_1_21_27