NIKOLOV , N. Integration of renewable energy systems in the infrastructure of smart cities. Annual of Natural Sciences Department, [S. l.], v. 9, p. 44–52, 2024. DOI: 10.33919/ansd.24.9.5. Disponível em: https://ojs.nbu.bg/index.php/ANSD/article/view/1166. Acesso em: 7 dec. 2025.