A Review of Hierarchical Routing Protocols in Wireless Sensor Networks: Types and Recent Developments. Al-Rafidain Engineering Journal (AREJ), [S. l.], v. 30, n. 2, p. 1–15, 2025. DOI: 10.33899/arej.2025.157162.1387. Disponível em: https://rengj.uomosul.edu.iq/index.php/rengj/article/view/53853. Acesso em: 22 sep. 2026.