%0 Journal Article %A A. A. Lyapunov %T The method of transfinite indices in the theory of operations over sets %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1973 %P 132-148 %V 133 %I mathdoc %U http://geodesic.mathdoc.fr/item/TM_1973_133_a13/ %G ru %F TM_1973_133_a13