Marinković, V. “Determination of Working Stress and Limiting Flanging Ratio in the Hole-Flanging Process of Sheet Metal Blanks”. Advanced Technologies and Materials, vol. 34, no. 1-2, Dec. 2009, pp. 81-95, https://atm-journal.uns.ac.rs/index.php/atm/article/view/jtp.2009.34.1-2.8.