Zhao, W., Fu, W., Yang, H., Tian, C., Li, M., Ding, J., Zhang, W., Zhou, X., Zhao, H., & Li, Y. (2011). Synthesis and Photocatalytic Activity of Fe-doped TiO2 Supported on Hollow Glass Microbeads. Nano-Micro Letters, 3(1), 20-24. https://doi.org/10.1007/BF03353647