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\bibitem{Vorobyeva_etal2013} {\textquotedblleft}\textit{Nanocrystalline ZnO(Ga) : paramagnetic centers, surface acidity and gas sensor properties}{\textquotedblright}. Vorobyeva N, Rumyantseva M, Filatova D, Konstantinova E, Grishina D, Abakumov A, Turner S, Gaskov A, Sensors and actuators : B : chemical \textbf{182}, 555 (2013).   http://doi.org/10.1016/j.snb.2013.03.068

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