Karaduman, Y.; Demir, A.; Öztürk, T.; Gül, B. Investigation of Structural, Optical and Photocatalytic Properties of Holmium–Niobium Co-Doped TiO2 Nanopowders. Acta Phys. Pol. A 2023, 143 (1), 75. https://doi.org/10.12693/APhysPolA.143.75.