@article{IVM_1997_2_a3,
     author = {V. G. Zvyagin},
     title = {The zero point index of a completely continuous perturbation of a {Fredholm} mapping that commutes with the action of a torus},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {47--55},
     publisher = {mathdoc},
     number = {2},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1997_2_a3/}
}