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\bibitem{Wu_etal2004} {\textquotedblleft}\textit{High precision determination of the elastic strain of InGaN/GaN multiple quantum wells}{\textquotedblright}. Wu MF, Zhou S, Yao S, Zhao Q, Vantomme A, van Daele B, Piscopiello E, Van Tendeloo G, Tong YZ, Yang ZJ, Yu TJ, Zhang GY, Journal of vacuum science and technology: B: microelectronics and nanometer structures \textbf{22}, 920 (2004).   http://doi.org/10.1116/1.1715085

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