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Ahmed, B. T., and M. C. Ramon,  "WiMAX in high altitude platforms (HAPs) communications over large cities",  \i Systems, Signals and Devices, 2009. SSD '09. 6th International Multi-Conference on\i0 , pp. 1-4, March, 2009.\par \par Ahmed, B. T., M. C. Ramon, and de. Haro L Ariet,  "Comments on the hybrid model for propagation loss prediction in tunnels",  \i Antennas and Propagation Magazine, IEEE\i0 , vol. 45, no. 5, pp. 156-158, Oct, 2003.\par \par Ahmed, B. T., M. C. Ramon, and L. de Haro y Ariet,  "The capacity of air-ground W-CDMA system (uplink analysis)",  \i Personal, Indoor and Mobile Radio Communications, 2002. The 13th IEEE International Symposium on\i0 , vol. 1, pp. 335-338 vol.1, Sept, 2002.\par \par }