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1957On 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 "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 Mathematica, Acta Math. 98(none), 110, (1957)
