@article{TM_1992_193_a33,
     author = {E. V. Troitskii},
     title = {An exact formula for the index of an equivariant $C^*$-elliptic operator},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {178--182},
     year = {1992},
     volume = {193},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1992_193_a33/}
}