1. Ames, M.P., Jr. and Vehslage, L.M., Low Frequency Geomagnetic Fluctuations (0.025 to 20 Hz) on the Floor of Monterey Bay, M.S. Thesis Naval Postgraduate School, Monterey, CA, 1981.
2. Bliokh, P.V., Nsholaenko AM., and Filippov Yu.F., Global’nye elektromagnitnye rezonansy v polosti Zemlya — ionosfera (Global Electromagnetic Resonances in the Earth-Ionosphere Cavity), Kiev: Naukova dumka, 1977.
3. Bogorodskii, V.V., Gusev, A.V., Polyakov, A.M., and Yartsev, M.B., Schumann Resonances at High Latitudes, Dokl. Akad. Nauk SSSR, 1982, vol. 267, no. 6, pp. 815–818.
4. Bosinger, T. and Shalimov, S.L., Dispersive Changes in Magnetic Background Noise Polarization at 0.1 to 6 Hz during Sunset and Sunrise at L = l.3, Ann. Geophys., 2004, vol. 22, no. 6, pp. 1989–2000.
5. Holtman, P.M. and McAskill, B.J., The Spatial Coherence of Schumann Activity in the Polar Cap, J. Atmos. Terr. Phys., 1988, vol. 50, no. 2, pp. 83–92.