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A. M. Samoilenko and N. I. Ronto, Numerical-Analytic Methods for Studying Periodic Solutions [in Russian], Vishcha Shkola, Kiev (1976).
J. L. Lions, Non-Homogeneous Boundary-Value Problems, Springer-Verlag (1972).
J. Hale, Oscillations in Nonlinear Systems [Russian translation], Mir, Moscow (1966).
V. N. Laptinskii, “On an algorithm for constructing periodic solutions of second-order linear systems,” Vestsi Akad. Nauk BSSR, Ser. Fiz.-Mat. Navuk, No. 3, 113–116 (1978).
L. V. Kantorovich and G. P. Akilov, Functional Analysis [in Russian], Nauka, Moscow (1977).
Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 33, No. 1, pp. 73–76, January–February, 1981.
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Laptinskii, V.N. An approximate method in the theory of oscillations. Ukr Math J 33, 59–61 (1981). https://doi.org/10.1007/BF01085779
- Approximate Method