[1]
ONDRÁŠKOVÁ, A. et al. 2009. A significant decrease of the fundamental Schumann resonance frequency during the solar cycle minimum of 2008-9 as observed at Modra Observatory. Contributions to Geophysics and Geodesy. 39, 4 (Dec. 2009), 345–354. DOI:https://doi.org/10.2478/v10126-009-0013-5.