NIKOLOV, N. Assessment of the ecological footprint of smart cities through sustainable development indicators. Annual of Natural Sciences Department, [S. l.], v. 10, p. 40–50, 2025. DOI: 10.33919/ansd.25.10.5. Disponível em: https://ojs.nbu.bg/index.php/ANSD/article/view/1406. Acesso em: 2 jun. 2026.