The optimisation of energy systems by using 3e factor: The case studies. Journal of Civil Engineering and Management, [S. l.], v. 12, n. 1, p. 63–68, 2006. DOI: 10.3846/13923730.2006.9636374. Disponível em: https://journals.vilniustech.lt/index.php/JCEM/article/view/8782. Acesso em: 10 may. 2025.