De Luca, L., R. De Franco, G. Biella, A. Corsi, and R. Tondi. “An Analysis of the First-Arrival times picked on the DSS and Wide-Angle seismic section Recorded in Italy since 1968”. Annals of Geophysics, vol. 47, no. 6, Dec. 2004, doi:10.4401/ag-3369.