Niobium doped TiO2 layers by chemical spray pyrolysisDündar, Ibrahim; Oja Acik, Ilona; Mere, Arvo; Katerski, Atanas; Krunks, Malle; Mikli, ValdekProceedings of 13th International Conference of Young Scientists on Energy Issues : CYSENI 2016 : May 26-27 2016, Kaunas, Lithuania2016 / p. VII-241 - VII-250