1. Alexiou, A., Kostarakis, P., & Christofilakis, V. (2005). Interaction between GSM handset helical antenna and user’s head: Theoretical analysis and experimental result. The Enviromentalist, 25, 215–221.
2. Arai, H. (2001). Measurement of Mobile Antenna Systems. Boston: Artech House, pp 214.
3. Arai, H., Igi, N., & Hanaoka, H. (1997). Antenna-gain measurement of handheld terminals at 900 MHz. IEEE Transactions on Vehicular Technology, 46(3), 537–545.
4. Atanasov, N. (2004). An investigation of adjusting output power transmitter in mobile station for GSM900. Telecom, 388–394.
5. Atanasov, N., & Atanasova, G. (2006) An investigation on electromagnetic field distribution in human head phantom from antenna on mobile phone. Telecom, Bulgaria, October 12–13, 2006, in printed.