• The impact of building renovation with heat pumps to competitiveness of district heating : Estonian district heating pricing system needs more flexibilityReino, Arbo; Härm, Mihkel; Hamburg, Arvi2017 IEEE 58th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON) : proceedings : Latvia, Riga, 12-13 October, 20172017 / [6] p. : ill http://dx.doi.org/10.1109/RTUCON.2017.8124791