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\bibitem{Siefridt_etal1998} Siefridt, L., Barnier, B., Legler, D. M., \& O{\textquoteright}Brien, J. J. (1998). 5-day average wind over North-West Atlantic from ERS1 using a variational analysis. \textit{Global Atmosphere and Ocean System}, \textit{5}, 317--344.

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