@article{SM_1982_41_1_a7,
     author = {A. V. Sarychev},
     title = {Stability of mappings of {Hilbert} space and equivalence of controlled systems},
     journal = {Sbornik. Mathematics},
     pages = {127--138},
     year = {1982},
     volume = {41},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1982_41_1_a7/}
}