%0 Journal Article %A M. A. Taitslin %T On elementary theories of commutative semigroups %J Algebra i logika %D 1966 %P 55-89 %V 5 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/AL_1966_5_4_a4/ %G ru %F AL_1966_5_4_a4