Manual plano oficial de contabilidade pública / António C. Pires Caiado, Ana Calado Pinto
Mobile cellular telecommunications systems / William C. Y. Lee
Biological effects and exposure criteria for radiofrequency electromagnetic fields : NCRP Report No. 86 (1995) / NCRP - National Council on Radiation Protection and Measurments
A practical guide to the determination of human exposure to radiofrequency fields : NCRP Report No. 119 (1993) / NCRP - National Council on Radiation Protection and Measurments