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\bibitem{Berg_etal2001} {\textquotedblleft}\textit{GP-zones in Al-Zn-Mg alloys and their role in artificial aging}{\textquotedblright}. Berg LK, Gj{\o}nnes J, Hansen V, Li XZ, Knutson-Wedel M, Waterloo G, Schryvers D, Wallenberg LR, Acta materialia \textbf{49}, 3443 (2001).   http://doi.org/10.1016/S1359-6454(01)00251-8

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