PEREZ, Gustavo De Jesus. On the essence and ontology of systems. Open Science Journal, [S. l.], v. 5, n. 3, 2020. DOI: 10.23954/osj.v5i3.2510. Disponível em: https://osjournal.org/ojs/index.php/OSJ/article/view/2510. Acesso em: 9 sep. 2025.