Lutsenko, I., Fomovskaya, O., Serdiuk, O., Baranovskaya, M. and Fomovskyi, V. (2018) “Development of test operations of different duration in terms of input for the verification of efficiency formula”, Eastern-European Journal of Enterprise Technologies, 5(4 (95), pp. 14–21. doi: 10.15587/1729-4061.2018.142212.