• Actual impact of heat pumps to energy performance of apartment buildings in EstoniaReino, Arbo; Hamburg, Arvi2019 IEEE 60th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON), 7-9 October 2019 : conference proceedings2019 / 6 p. : ill https://doi.org/10.1109/RTUCON48111.2019.8982370