Gokhberg, M. B. “Background Electromagnetic Noisein the Vicinity 1 Hz As a Possible Indicatorof Earthquake-Related Anomalies”. Annals of Geophysics 47, no. 1 (December 25, 2004). Accessed May 30, 2024. https://www.annalsofgeophysics.eu/index.php/annals/article/view/3274.