Cartwright, H. L.; Littlewood, J. E. On non-linear differential equations of the second order. II. The equation \(\ddot y+kf(y)\dot y+g(y,k)=p(t)=p_1(t)+kp_2(t)\); \(k>0,f(y)\geq 1\). (English) Zbl 0029.12602 Ann. Math. (2) 48, 472-494 (1947). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 1 ReviewCited in 36 Documents Keywords:Ordinary differential equations PDF BibTeX XML Cite \textit{H. L. Cartwright} and \textit{J. E. Littlewood}, Ann. Math. (2) 48, 472--494 (1947; Zbl 0029.12602) Full Text: DOI OpenURL