1. Adams, L. H.: Elastic properties in the earth's crust. In:Gutenberg, Internal Constitution of the Earth, Dover Publ., 1951.
2. Benioff, H.: Orogenesis and deep crustal structure-additional evidence from seismology. Geol. Soc. Amer., Bull.65, S. 385–400, 1954.
3. Bullen, K. E.: An Introduction to the Theory of Seismology. Cambridge Univ. Press, 1953.
4. Byerly, P., andTuller, B.: Sierran root. Vortrag, Seismol. Soc. Amer., 1954.
5. Caloi, P.: Struttura Geologico-sismica dell'Europa. Ann. di Geofisica5, S. 507–518, 1952.