“Quadrature Based Energy Efficient Hierarchical Routing Protocol for Heterogeneous Wireless Sensor Networks”, Int. J. Curr. Eng. Technol., vol. 5, no. 3, pp. 1922–1925, Jun. 2015, Accessed: Apr. 07, 2026. [Online]. Available: https://ijcet.evegenis.org/index.php/ijcet/article/view/2278