Rogoža, Artur, Giedrius Šiupšinskas, and Juozas Bielskus. “Case Analysis of Heat Pump Integration in District Heating System”. Mokslas – Lietuvos ateitis / Science – Future of Lithuania 13 (October 11, 2021). Accessed May 3, 2024. https://journals.vilniustech.lt/index.php/MLA/article/view/15272.