Rosidah, S., and F. Felayani. “Effect Of Heel Effect Anode On Image Homogeneity Based On X-Ray Collimation Light Beam Area”. Jurnal EduHealth, vol. 13, no. 01, Sept. 2022, pp. 400-6, https://ejournal.seaninstitute.or.id/index.php/healt/article/view/502.