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\bibitem{Volkov_etal1997} {\textquotedblleft}\textit{LPE growth and characterization of InGaAsP/InP heterostructures: IR-emitting diodes at 1.66 μm: application to the remote monitoring of methane gas}{\textquotedblright}. Volkov VV, van Landuyt J, Marushkin K, Gijbels R, F{\'e}rauge C, Vasilyev MG, Shelyakin AA, Sokolovsky AA, Sensors and actuators : A : physical \textbf{62}, 624 (1997).   http://doi.org/10.1016/S0924-4247(97)01377-0

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