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2. The solution of van der Pol's equation in Chebychev series;Clenshaw,1966
3. Solutions to van der Pol's equation using a perturbation method;Davis;Int. J. Non-Linear Mech.,1967
4. Asymptotic solutions of the van der Pol's equation;Dorodnitsyn;Prik. Mat. i Mech.,1947
5. Introduction to Numerical Analysis and Applications;Greenspan,1971