Movrin, D., M. Penčić, S. Dudić, M. Čavić, M. Milutinović, and D. Vilotić. “Experimental Investigation of Contact Conditions in Tube End Forming Process by Tapering”. Advanced Technologies and Materials, vol. 41, no. 2, Dec. 2016, pp. 45-54, https://jged.uns.ac.rs/index.php/atm/article/view/jtp.2016.41.2.5.