Lutsenko, I., O. Fomovskaya, O. Serdiuk, M. Baranovskaya, and V. Fomovskyi. “Development of Test Operations of Different Duration in Terms of Input for the Verification of Efficiency Formula”. Eastern-European Journal of Enterprise Technologies, vol. 5, no. 4 (95), Sept. 2018, pp. 14-21, doi:10.15587/1729-4061.2018.142212.