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E. J. Siachalou and S. M. Panas, "On the optimum down tilt angle in base station antennas for wireless communictions," Proceedings of the Mediterranean Microwave Symposium 2005, (Athens, Greece, 6-8 September, 2005).

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A. Dimitriou, E. Siachalou and J. Sahalos, "Estimation of the Optimum Downtilt Angle in Base Station Antennas for Capacity Maximization & Power Minimization", COST IC0803 (RF/Microwave Communication Subsystems for Emerging Wireless Technologies, Lausanne, November 8-9, 2010).