@article{RM_1970_25_5_a1,
     author = {B. S. Mityagin},
     title = {The homotopy structure of the linear group of {a~Banach} space},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {59--103},
     publisher = {mathdoc},
     volume = {25},
     number = {5},
     year = {1970},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1970_25_5_a1/}
}