Mazurenko, A., Denysova, A., Balasanian, G., Klimchuk, A. and Borysenko, K. (2017) “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, 1(8 (85), pp. 27–33. doi: 10.15587/1729-4061.2017.92495.