%0 Journal Article %A Tetruashvili, M. %T Complexity of the decidability of one class of formulas in quantifier-free set theory with a set-union operator. %J Georgian Mathematical Journal %D 1996 %P 97-100 %V 3 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/GMJ_1996__3_1_47540/ %G en %F GMJ_1996__3_1_47540