Seidl, D., M. Hellweg, H. Rademacher, D. M. Gomez M., and R. A. Torres C. “The Anatomy of a Tornillo: Puzzles from Three-Component Measurements at Galeras Volcano (Colombia)”. Annals of Geophysics 42, no. 3 (November 25, 1999). Accessed May 11, 2024. https://www.annalsofgeophysics.eu/index.php/annals/article/view/3724.