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Approximate determination of the limit cycle of van der Pol’s equation for \(\varepsilon\leq 1\). (Näherungsbestimmung des Grenzzyklus der van der Polschen Gleichung für \(\varepsilon\leq 1\).) (Russian) Zbl 0179.13104

MSC:

34C07 Theory of limit cycles of polynomial and analytic vector fields (existence, uniqueness, bounds, Hilbert’s 16th problem and ramifications) for ordinary differential equations
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