Babel, Sandhya, Hanggara Sudrajat, and Ajay Aby Abraham. 2016. “Manganese- and Iron-Doped Zinc Oxide for Photocatalytic Degradation of Recalcitrant Dyes”. Science & Technology Asia 21 (4):33-43. https://ph02.tci-thaijo.org/index.php/SciTechAsia/article/view/72005.