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On non-linear differential equations of the second order. III: The equation $$\ddot y - k(1-y^2) \dot y +y=b \mu k\;cos (\mu t + \alpha)$$ for large $$k$$, and its generalizations. IV: The general equation $$\ddot y + kf(y) \dot y +g(y)=bkp (\varphi),\;\varphi = t + \alpha$$. (English) Zbl 0081.08401
Acta Math. 97, 267-308 (1957); 98, 1-110 (1957).

##### Keywords:
ordinary differential equations
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##### References:
 [1] The reverse of a non-stable is a non-stable. [2] N. Levinson,Journal of Math. and Physics, 22 (1943), 41–48. · Zbl 0061.18909
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