Nb2O5-doped TiO2 film synthesised via sol-gel method - technology and optical characterisation. - Zięba, Magdalena; Tyszkiewicz, Cuma; Opilski, Zbigniew; Barczak, Kamil; Nizioł, Jacek; Gondek, Ewa; Karasiński, Paweł (Opto-Electronics Review, 2026)