@article{MZM_1991_50_4_a1,
     author = {A. V. Arutyunov},
     title = {Properties of quadratic maps in a {Banach} space},
     journal = {Matemati\v{c}eskie zametki},
     pages = {10--20},
     publisher = {mathdoc},
     volume = {50},
     number = {4},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1991_50_4_a1/}
}