Coulomb, J. “Les Pulsations Du Champ magnétique Terrestre Et Des Courants Telluriques”. Annals of Geophysics 12, no. 4 (November 25, 1959): 461–487. Accessed May 6, 2024. https://www.annalsofgeophysics.eu/index.php/annals/article/view/5731.