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The study has been carried out within the framework of the CTIAC international project with the support of the Russian Foundation of Basic Research (grant 95-01-21076).
Translated from Metody Analiza Nelineinykh Sistem, Moscow University, pp. 5–29, 1997.
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Bobylev, N.A., Korovin, S.K. Duality theorems in the theory of nonlinear oscillations. Comput Math Model 9, 1–23 (1998). https://doi.org/10.1007/BF02404081
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DOI: https://doi.org/10.1007/BF02404081