Fahlén, Per, Hendrik Voll, and Jüri Naumov. “Efficiency of Pump Operation in Hydronic Heating and Cooling Systems”. Journal of Civil Engineering and Management 12, no. 1 (March 31, 2006): 57-62. Accessed July 6, 2024. https://jau.vgtu.lt/index.php/JCEM/article/view/8781.