Mandić, V., Živković, M., Vulović, S., & Marinković, T. (2004). FEM analysis for the extrusion process of tubes using porthole dies. Advanced Technologies and Materials, 29(1-2), 35–43. Retrieved from https://atm-journal.uns.ac.rs/index.php/atm/article/view/jtp.2004.29.1-2.4