Plančak, Miroslav, Marko Skunca, and Miljenko Math. 2004. “Analysis, FEM Simulation and Experimental Verification of Gear Cold Extrusion”. Advanced Technologies and Materials 29 (1-2):11-23. https://jged.uns.ac.rs/index.php/atm/article/view/jtp.2004.29.1-2.2.