Fadaei, Mahvan, Mahdieh Abdipour, and Mehdi Dindar Rostami. 2018. “Choosing Proper Cluster Heads to Reduce Energy Consumption in Wireless Sensor Networks Using Gravitational Force Algorithm”. International Academic Journal of Science and Engineering 5 (2): 77-86. https://doi.org/10.9756/IAJSE/V5I1/1810028.