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\bibitem{Lenaerts_etal1994} {\textquotedblleft}\textit{In situ infrared and electrical characterization of tin dioxide gas sensors in nitrogen/oxygen mixtures at temperatures up to 720 K}{\textquotedblright}. Lenaerts S, Honor{\'e} M, Huyberechts G, Roggen J, Maes G, Sensors and actuators : B : chemical \textbf{19}, 478 (1994).   http://doi.org/10.1016/0925-4005(93)01048-9

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