Ursino, A., H. Langer, L. Scarfì, G. Di Grazia, and S. Gresta. “Discrimination of Quarry Blasts from Tectonic Microearthquakes in the Hyblean Plateau (Southeastern Sicily)”. Annals of Geophysics, vol. 44, no. 4, Dec. 2001, doi:10.4401/ag-3569.