Ivanišević, A., D. Vilotić, M. Plančak, I. Kačmarčik, D. Movrin, M. Milutinović, and P. Skakun. “Contact Stresses and Forming Load in Upsetting of Prismatic Billets by V-Shape Dies”. Advanced Technologies and Materials, vol. 37, no. 2, Dec. 2012, pp. 133-41, https://jged.uns.ac.rs/index.php/atm/article/view/JTP.2012.37.2.3.