Salikin, M. S., A. Aziz Md Ramli, M. Jamal Md Isa, H. Salleh, and M. Khalid Matori. “The Use of Water Phantoms in Quality Control of General X-Ray Machine for Diagnostic Radiology”. Malaysian Journal of Science, vol. 21, Dec. 2002, pp. 151-6, https://ajap.um.edu.my/index.php/MJS/article/view/8879.