Vilotić, D., M. Plančak, A. Bramley, and F. Osman. “Investigation of Upsetting of Cylinder by Conical Dies”. Advanced Technologies and Materials, vol. 27, no. 1-2, Dec. 2002, pp. 19-26, https://atm-journal.uns.ac.rs/index.php/atm/article/view/jtp.2002.27.1-2.2.