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\bibitem{Ferroni_etal2000} {\textquotedblleft}\textit{Structural characterization of Nb-TiO$_{2}$ nanosized thick-films for gas sensing application}{\textquotedblright}. Ferroni M, Carotta MC, Guidi V, Martinelli G, Ronconi F, Richard O, van Dyck D, van Landuyt J, Sensors and actuators : B : chemical \textbf{68}, 140 (2000).   http://doi.org/10.1016/S0925-4005(00)00474-3

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