Tai, L. N., D. T. Hoa, and L. V. Hong. “Abnormal Photoluminescence of TiO\(_{2}\) Nanocrystals (nanoparticles and Nanotube Arrays)”. Communications in Physics, vol. 24, no. 3, Oct. 2014, p. 275, doi:10.15625/0868-3166/24/3/5086.