Dindar, Bircan, and Ozlem Seven. “Photodegradation of 2,4-Dichlorophenoxy Acetic Acid on TiO2, ZnO and Fe2O3 by Sunlight”. Asian Journal of Chemistry, vol. 21, no. 3, Mar. 2010, pp. 2270-82, https://asianpubs.org/index.php/ajchem/article/view/18727.