Dr. Hasan Wahhab salih, D. M. M. “Enhanced Data Transmission in Wireless Sensor Networks Using Cluster Head Selection Optimization and Identity-Based Batch Verification”. International Journal of Advanced Science and Technology, Vol. 29, no. 1, Jan. 2020, pp. 1028 -42, http://sersc.org/journals/index.php/IJAST/article/view/3596.