1Kelley, M. C. (2009). The Earth's ionosphere: Plasma physics and electrodynamics (2nd ed.). Academic Press.
2Schumann, W. O. (1952). Über die strahlungslosen Eigenschwingungen einer leitenden Kugel. Zeitschrift für Naturforschung A, 7(2), 149–154.
3Williams, E. R. (2009). The global electrical circuit: A review. Atmospheric Research, 91(2–4), 140–152.
4Volland, H. (Ed.). (1995). Handbook of atmospheric electrodynamics (Vol. 1). CRC Press.
5Burch, J. B., Reif, J. S., & Yost, M. G. (1999). Geomagnetic disturbances are associated with reduced nocturnal excretion of melatonin. Cancer Letters, 138(1–2), 215–220.
6Price, C., Yair, Y., & Asfur, M. (2007). East Africa as the source of Schumann resonance background. Geophysical Research Letters, 34(4), L04103.
7Cherry, N. J. (2002). Schumann resonances, a plausible biophysical mechanism. Natural Hazards, 26(3), 279–331.