Ibrahim, Siti Aida, Abdul Hadi Zainal Alam, Rosniza Hussin, Zakiah Kamdi, Mohamed Nasrul Mohamed Hatta, Ainun Rahmahwati Ainuddin, and Muhamad Zaini Yunos. 2018. “Effect of Calcination Temperature on (N, Fe) Doped TiO2 Nanoparticles”. Journal of Science and Technology 10 (2). https://penerbit.uthm.edu.my/ojs/index.php/JST/article/view/2950.