Yusri Abd. Rahman, M., M. Mat Salleh, I. Abu Talib, and M. Yahaya. “Microstructure and Phase Structure of Titanium Dioxide Films Prepared by Screen-Printing Technique”. Malaysian Journal of Science, vol. 21, Dec. 2002, pp. 157-60, http://mojes.um.edu.my/index.php/MJS/article/view/8880.