Umar Sani, Mohd Murtadha Mohamad. “Void Avoidance and Challenges in Underwater Wireless Sensor Network: A Review”. International Journal of Advanced Science and Technology, Vol. 29, no. 10s, May 2020, pp. 1401 -1, http://sersc.org/journals/index.php/IJAST/article/view/14651.