Khalid A. Asaad, Saffer, A.A., Sarkawt H. Abdulqadir and Soran A. Pasha 2024. ECR-IoT: Energy-efficient and cluster-based routing method for WSN-based IoT using Harris hawk’s and whale optimization algorithms. Zanco Journal of Pure and Applied Sciences. 36, 3 (Jun. 2024), 43–60. DOI:https://doi.org/10.21271/ZJPAS.36.3.6.