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1957 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
J. E. Littlewood
Acta Math. 98: 110-110 (1957). DOI: 10.1007/BF02404471
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Vol.98 • 1957
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