Literature cited
L. A. Lyusternik and V. I. Sobolev, Elements of Functional Analysis [in Russian], Moscow (1965).
L. E. El'sgol'ts, Qualitative Methods in Mathematical Analysis [in Russian], Moscow (1955).
D. G. Korenevskii and S. F. Feshchenko, “On the theory of systems with distributed parameters and lag,” UMZh., 19, No. 4 (1967).
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Translated from Ukrainskii Matematicheskii Zhurnal, Vol.21, No. 1, pp. 108–110, January–February, 1969.
In conclusion, let us note that paper is a direct continuation of the authors research [3] on higher order equations.
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Korenevskii, D.G., Feshchenko, S.F. On the Cauchy problem for a hyperbolic equation with functionally perturbed argument. Ukr Math J 21, 89–90 (1969). https://doi.org/10.1007/BF01086688
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DOI: https://doi.org/10.1007/BF01086688