Chen, Hong, et al. “Trace Detection Towards 2,4,6-Trinitro Phenol at Surface of TiO2 Nanoparticles Based on Fluorescence Resonance Energy Transfer”. Asian Journal of Chemistry, vol. 24, no. 9, May 2012, pp. 4025-7, https://asianpubs.org/index.php/ajchem/article/view/9533.