C. Intanagonwiwat, D. Estrin, R. Govindan, and J. Heidemann, “Impact of network density on data aggregation in wireless sensor networks,” in Proceedings of the 22nd International Conference on Distributed Computing Systems (ICDCS’02), July 2002.
 V. Erramilli, I. Matta, and A. Bestavros , “On the interaction between data aggregation and topology control in wireless sensor networks,” First Annual IEEE Communications Society Conference on Sensor and Ad Hoc Communications and Net-works, IEEE SECON, pp. 557–565, 2004.
 A. Boulis, S. Ganeriwal, and M. B. Srivastava, “Aggregation in sensor networks: An energy-accuracy trade- off,” First IEEE International Workshop Sensor Network Protocols and Appli-cations (SNPA’03), May 2003.
 Z. Ye, A. A. Abouzeid, and J. Ai, “Optimal policies for distrib-uted data aggregation in wireless sensor networks,” in Pro-ceedings of 26th Annual IEEE Conference on Computer Communications (INFOCOM’07), Anchorage, Alaska, USA, May 6–12, 2007.
 N. Shrivastava, C. Buragohain, D. Agrawal, and S. Suri, “Me-dians and beyond: New aggregation techniques for sensor net-works,” in Proceedings of the Second ACM Conference on Embedded Networked Sensor Systems (SenSys’04), August 2004.
 K. Padmanabh and R. Roy, “Cost sensitive pushout policy and expelling polices with dynamic threshold for the buffer man-agement in differentiated service switch for versatile traffic,” IEEE International Conference on Networking, Mauritius, April 23–28, 2006.