Hardy, H. R., Jr., & Reginald-Hardy, H. (1989). Acoustic emission/microseismic activity in geologic structures and materials: Proceedings of the fourth conference held at the Pensylvania State University Park, Pensylvania October 22-24, 1985. Clausthal, Germany: Trans Tech Publications.
Παραπομπή Chicago StyleHardy, H. Reginald, Jr., and H. Reginald-Hardy. Acoustic Emission/microseismic Activity in Geologic Structures and Materials: Proceedings of the Fourth Conference Held At the Pensylvania State University Park, Pensylvania October 22-24, 1985. Clausthal, Germany: Trans Tech Publications, 1989.
Παραπομπή MLAHardy, H. Reginald, Jr., and H. Reginald-Hardy. Acoustic Emission/microseismic Activity in Geologic Structures and Materials: Proceedings of the Fourth Conference Held At the Pensylvania State University Park, Pensylvania October 22-24, 1985. Clausthal, Germany: Trans Tech Publications, 1989.