Razali, Mohd Hasmizam, et al. “Thermal Stability on Morphology and Crystal Structures of Hydrothermally Synthesized Titanate Nanotubes and Their Photocatalytic Activity”. Asian Journal of Chemistry, vol. 29, no. 10, Aug. 2017, pp. 2207-10, doi:10.14233/ajchem.2017.20684.