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Littlewood, J.E. On non-linear differential equations of the second order. III. The equation\(\ddot y - k\left( {1 - y^2 } \right)\dot y + y = b\mu k\) cos (μt+α) for large k, and its generalizationscos (μt+α) for large k, and its generalizations. Acta Math. 98, 110 (1957). https://doi.org/10.1007/BF02404471
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DOI: https://doi.org/10.1007/BF02404471