References
The reverse of a non-stable is a non-stable.
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Littlewood, J.E. 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 largek, and its generalizationsfor largek, and its generalizations. Acta Math. 97, 267–308 (1957). https://doi.org/10.1007/BF02392400
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DOI: https://doi.org/10.1007/BF02392400