Tarvainen, M. “The Capability of Three Component Substation FIA1 at Local and Regional Distances. Comparisons With FINESA and Helsinki Bulletins”. Annals of Geophysics 37, no. 3 (November 25, 1994). Accessed May 31, 2026. https://www.annalsofgeophysics.eu/index.php/annals/article/view/4206.