Literature cited
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R. G. Aliev, “On the solvability of an equation with deviating argument in a Hilbert space,” Dokl. Akad. Nauk SSSR,247, No. 6, 1289–1291 (1979).
K. Yosida, Functional Analysis, Second Edition, Springer-Verlag, New York (1968).
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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 34, No. 4, pp. 477–483, July–August, 1982.
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Aliev, R.G. Estimation of the characteristic index of an equation with retarded argument in a Hilbert space by the method of freezing. Ukr Math J 34, 386–391 (1982). https://doi.org/10.1007/BF01091594
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DOI: https://doi.org/10.1007/BF01091594