1. Pre-earthquake and post-earthquake superficial displacements in the Parkfield earthquakes of June 27-29, 1966, Monterey and San Luis Obispo counties, California;Allen;Bull. seism. Soc. Am.,1966
2. Displacements on the Imperial, Superstition Hill, and San Andreas faults triggered by the Borrego Mountain earthquake, The Borrego Mountain earthquake of April 9, 1968;Allen;US Geol. Surv. Prof. Pap.,1972
3. Le variazioni d'inclinazione e la sismicità che hanno preceduto il forte terremoto del Friuli del 6 maggio 1976;Biagi;Ann. Geofis.,1976