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Marinca, V., Herişanu, N. & Bota, C. Application of the variational iteration method to some nonlinear one-dimensional oscillations. Meccanica 43, 75–79 (2008). https://doi.org/10.1007/s11012-007-9086-2
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DOI: https://doi.org/10.1007/s11012-007-9086-2