Ahmed, B. T., and M. C. Ramon,  "Downlink capacity and interference statistics of wideband code division multiple access microcells for trains in long tunnels",  Communications, IET, vol. 3, no. 4, pp. 603-609, April, 2009.

Taha-Ahmed, B., M. Calvo-Ramon, L. Haro-Ariet, and R. M. Rodriguez-Osorio,  "On the UMTS macrocells downlink capacity in open rural zone near shaded Deep Space Network (DSN) installations",  Vehicular Technology Conference, 2004. VTC2004-Fall. 2004 IEEE 60th, vol. 7, pp. 5245-5249 Vol. 7, Sept, 2004.