MATULIS, Jānis; TEIRUMNIEKA, Ērika. ENERGY EFFICIENCY IMPROVEMENT PLAN. HUMAN. ENVIRONMENT. TECHNOLOGIES. Proceedings of the Students International Scientific and Practical Conference, Rezekne, Latvia, n. 22, p. 140–145, 2018. DOI: 10.17770/het2018.22.3622. Disponível em: https://journals.ru.lv/index.php/HET/article/view/3622.. Acesso em: 3 may. 2024.