Amoruso, A., L. Crescentini, G. De Luca, R. Scarpa, M. Abril, and Al. Cirella. 1997. “Underground Earth Strain and Seismic Radiation Measurements With a Laser Interferometer and a Dense Small-Aperture Seismic Array”. Annals of Geophysics 40 (5). https://doi.org/10.4401/ag-3841.