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1957On 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 generalizationsfor large k, and its generalizations
J. E. Littlewood "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 generalizationsfor large k, and its generalizations," Acta Mathematica, Acta Math. 97(none), 267-308, (1957)
