G. O. El-Sayed, H. A. Dessouki, H. S. Jahin, and S. S. Ibrahiem. 2015. “Photocatalytic Degradation of Tetracycline in Aqueous Solutions by Kaolin Nanoparticles”. World Journal of Pharmaceutical Sciences 3 (4):779-86. https://wjpsonline.com/index.php/wjps/article/view/photocatalytic-degradation-tetracycline-kaolin-nanoparticles.