Nguyễn , . T. T., T. S. Trần, and T. H. M. Nguyễn. “An Experimental Study on the Influence of Input Parameters on Bend Allowance in Bending of Sheet Metal”. Journal of Technical Education Science, vol. 8, no. 3, Dec. 2013, pp. 27-36, https://www.jte.edu.vn/index.php/jte/article/view/739.