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\bibitem{Choi_etal2013} Choi, K. - Y., Vecchi, G. A., \& Wittenberg, A. T. (2013). ENSO Transition, Duration, and Amplitude Asymmetries: Role of the Nonlinear Wind Stress Coupling in a Conceptual Model. \textit{J. Climate}, \textit{26}(23), 9462--9476.

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