Kukhar, V. V., and V. A. Burko. 2015. “Resource Saving Technologies of Die Forging of Copper Axially Asymmetric (round in Shape) Forgings on the Basis of Preliminary Forming of Forgings Side Profile Formation Forming of the Forged Billets Parts by Means of Free Preliminary Upsetting”. Reporter of the Priazovskyi State Technical University. Section: Technical Sciences, no. 29 (March):36-48. https://doi.org/10.31498/2225-6733.29.2014.39117.