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Translated from Matematicheskie Zametki, Vol. 50, No. 4, pp. 10–20, October, 1991.
The author expresses sincere gratitude to V. M. Tikhomirov for discussion of the results of this paper.
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Arutyunov, A.V. Properties of quadratic maps in a Banach space. Mathematical Notes of the Academy of Sciences of the USSR 50, 993–999 (1991). https://doi.org/10.1007/BF01137725
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DOI: https://doi.org/10.1007/BF01137725