Hoi Jin, W., M. Ambar Yarmo, S. Radiman, A. Ramli, H. Atan, and T. Chow Khim. “X-Ray Photoelectron Spectroscopy Investigation over Supported Palladium Catalyst Prepared Using Water-in-Oil Microemulsion”. Malaysian Journal of Science, vol. 21, Dec. 2002, pp. 47-54, https://juku.um.edu.my/index.php/MJS/article/view/8858.