Do DC, Tran NT, Hill R, Nguyen DK. Relative output factors of different collimation systems in truebeam STx medical linear accelerator. Nucl. Sci. and Tech. [Internet]. 2021Sep.3 [cited 2024May5];9(4):48-55. Available from: http://jnst.vn/index.php/nst/article/view/137