Giubbolini, L., and L. Sambuelli. “New Developments in Ground Probing Radar: The Possibility of Reconstructing a Holographic Image of Underground Reflectivity”. Annals of Geophysics 43, no. 6 (December 25, 2000). Accessed May 1, 2024. https://www.annalsofgeophysics.eu/index.php/annals/article/view/3686.