Rogoža, Artur, Kestutis Čiuprinskas, and Giedrius Šiupšinskas. “The Optimisation of Energy Systems by Using 3e Factor: The Case Studies”. Journal of Civil Engineering and Management 12, no. 1 (March 31, 2006): 63-68. Accessed April 29, 2024. https://journals.vilniustech.lt/index.php/JCEM/article/view/8782.