Cartwright, M. L. A comparison of relationships between various kinds of damping and restoring forces. (English) Zbl 0497.34025 Probl. asymp. Theory nonlin. Oscill., Acad. Sci. Ukr. SSR, Inst. Math., 93-100 (1977). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page MSC: 34C10 Oscillation theory, zeros, disconjugacy and comparison theory for ordinary differential equations Keywords:restoring forces; van der Pol equation; damping forces Citations:Zbl 0374.00009 PDFBibTeX XML