%0 Journal Article %A N. A. Peryazev %T Positive indistinguishability of algebraic systems, and completeness of positive theories %J Matematičeskie zametki %D 1985 %P 208-217 %V 38 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZM_1985_38_2_a3/ %G ru %F MZM_1985_38_2_a3