Taha-Ahmed, B., M. Calvo-Ramon, and L. de Haro-Ariet,  "High altitude platforms (HAPs) W-CDMA system over cities",  Vehicular Technology Conference, 2005. VTC 2005-Spring. 2005 IEEE 61st, vol. 4, pp. 2673-2677 Vol. 4, May, 2005.

Taha-Ahmed, B., M. Calvo-Ramon, and L. de Haro-Ariet,  "Down-link analysis of a FDSS-GSM overlay system",  Vehicular Technology Conference, 2004. VTC 2004-Spring. 2004 IEEE 59th, vol. 5, pp. 2502-2506, May, 2004.

Taha-Ahmed, B., M. Calvo-Ramon, and L. de Haro-Ariet,  "W-CDMA uplink capacity and interference statistics of a long tunnel cigar-shaped microcells (underground train case)",  Personal, Indoor and Mobile Radio Communications, 2004. PIMRC 2004. 15th IEEE International Symposium on, vol. 3, pp. 2231-2235 Vol.3, Sept, 2004.