Hrudkina, N., Aliieva, L., Abhari, P., Kuznetsov, M. and Shevtsov, S. 2019. Derivation of engineering formulas in order to calculate energy-power parameters and a shape change in a semi-finished product in the process of combined extrusion. Eastern-European Journal of Enterprise Technologies. 2, 7 (98) (Mar. 2019), 49–57. DOI:https://doi.org/10.15587/1729-4061.2019.160585.