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\bibitem{Rumyantseva_etal2020} {\textquotedblleft}\textit{Sub-ppm H2S sensing by tubular ZnO-Co3O4 nanofibers}{\textquotedblright}. Rumyantseva MN, Vladimirova SA, Platonov VB, Chizhov AS, Batuk M, Hadermann J, Khmelevsky NO, Gaskov AM, Sensors And Actuators B-Chemical \textbf{307}, 127624 (2020).   http://doi.org/10.1016/j.snb.2019.127624

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