Mazurenko, A., A. Denysova, G. Balasanian, A. Klimchuk, and K. Borysenko. “Improving the Operation Modes Efficiency in Heat Pump Systems of Hot Water Supply With the Two-Stage Heat Accumulation”. Eastern-European Journal of Enterprise Technologies, vol. 1, no. 8 (85), Feb. 2017, pp. 27-33, doi:10.15587/1729-4061.2017.92495.