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Malfliet, Willy; Hereman, Willy The tanh method. II: Perturbation technique for conservative systems. (English) Zbl 0942.35035 Phys. Scr. 54, No. 6, 569-575 (1996). MSC: 35C05 35Q53 PDF BibTeX XML Cite \textit{W. Malfliet} and \textit{W. Hereman}, Phys. Scr. 54, No. 6, 569--575 (1996; Zbl 0942.35035) Full Text: DOI OpenURL