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\bibitem{Volkov_etal1997} {\textquotedblleft}\textit{Characterization of LPE grown InGaAsP/InP heterostructures: IR-LED at 1.66 μm used for the remote monitoring of methane gas}{\textquotedblright}. Volkov VV, van Landuyt J, Marushkin KM, Gijbels R, F{\'e}rauge C, Vasilyev MG, Shelyakin AA, Sokolovsky AA, Journal of crystal growth \textbf{173}, 285 (1997)

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