Caputo, M. “Modern Rheology and Electric Induction: Multivalued Index of Refraction, Splitting of Eigenvalues and Fatigue”. Annals of Geophysics 39, no. 5 (November 25, 1996). Accessed April 26, 2024. https://www.annalsofgeophysics.eu/index.php/annals/article/view/4026.