1. Baba K, Hayakawa M (1995) The effect of localized ionospheric perturbations on subionospheric VLF propagation on the basis of finite element method. Radio Sci 30:1511–1517
2. Bateman H, Erdelyi A (1953) Higher transcendental functions, vol 1. McGraw-Hill Co., New York 296 pp
3. Belyaev GG, Schekotov AYu, Shvets AV, Nickolaenko AP (1999) Schumann resonances observed using poynting vector spectra. J Atmos Solar-Terr Phys 61:751–763
4. Berenger JP (2002) FDTD computation of VLF-LF propagation in the Earth-ionosphere waveguide. Ann Telecommun 5(11–12):1059–1070
5. Bliokh PV, Galyuk YuP, Hynninen EM, Nickolaenko AP, Rabinowicz LM (1977) On the resonance phenomena in the Earth-ionosphere cavity. Izvestiya Vuzov, Radiofizika 20:501–509 (in Russian)