Electromagnetic shape resonances of a dielectric sphere and radiation of   portable telephones
  The frequency band used by cellular telephones includes the eigenfrequencies of a dielectric sphere with physical characteristics close to those of a human head. Proceeding from the spatial features of the natural modes of such a sphere we propose an independent and clear evident accuracy test for the complicated numerical calculations which are conducted when estimating the potential hazard due to the use of cellular telephones, in particular, for the check of a proper handling of the electromagnetic shape resonances of a human head. 
V.V. Nesterenko, A. Feoli, G. Lambiase, G. Scarpetta