%0 Journal Article %A E. V. Troitskii %T An exact formula for the index of an equivariant $C^*$-elliptic operator %J Informatics and Automation %D 1992 %P 178-182 %V 193 %I mathdoc %U http://geodesic.mathdoc.fr/item/TRSPY_1992_193_a33/ %G ru %F TRSPY_1992_193_a33