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\bibitem{Krishnamurti_etal2003} Krishnamurti, T. N., Rajendran, K., Vijaya Kumar, T. S. V., Lord, S., Toth, Z., Zou, X., et al. (2003). Improved Skill for the Anomaly Correlation of Geopotential Heights at 500 hPa. \textit{Mon. Wea. Rev.}, \textit{131}(6), 1082--1102.

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