@article{RM_1990_45_1_a9,
     author = {A. A. Irmatov},
     title = {Topology of the space of {Fredholm} operators and invariants of non-linear {Fredholm} maps},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {205--206},
     publisher = {mathdoc},
     volume = {45},
     number = {1},
     year = {1990},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1990_45_1_a9/}
}