Geodesic
The degree of equivariant Fredholm maps
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 28 (1973) no. 6 
V. G. Zvyagin; È. M. Muhamadiev; Yu. I. Sapronov. The degree of equivariant Fredholm maps. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 28 (1973) no. 6. http://geodesic.mathdoc.fr/item/RM_1973_28_6_a19/
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     title = {The degree of equivariant {Fredholm} maps},
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     volume = {28},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1973_28_6_a19/}
}
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