1. O. Younis, M. Krunz and S. Ramasubramanian, Node clustering in wireless sensor networks: Recent developments and deployment challenges, IEEE network, Vol. 20, No. 3, pp. 20–25, 2006.
2. G. Werner-Allen, J. Johnson, M. Ruiz, J. Lees, and M. Welsh, “Monitoring volcanic eruptions with a wireless sensor network,” in Proceeedings of the Second European Workshop on Wireless Sensor Networks, 2005, pp. 108–120.
3. F. M. Al-Turjman, H. S. Hassanein and M. A. Ibnkahla, Efficient deployment of wireless sensor networks targeting environment monitoring applications, Computer Communications, Vol. 36, No. 2, pp. 135–148, 2013.
4. J.-H. Chang, et al., An efficient relay sensor placing algorithm for connectivity in wireless sensor networks, Journal of Information Science and Engineering, Vol. 27, No. 1, pp. 381–392, 2011.
5. X. Cheng, D.-Z. Du, L. Wang and B. Xu, Relay sensor placement in wireless sensor networks, Wireless Networks, Vol. 14, No. 3, pp. 347–355, 2008.