1. Stress-history effects on shear modulus of soils;Afifi;Soils and Foundations,1973
2. Geotechnical characterization of Fucino clay;A. G. I,1991
3. On the compressibility and shear strength of natural clays;Burland;30th Rankine Lecture, Geotechnique,1992
4. Seismic cone penetration test;Campanella,1986
5. Elastic wave velocities in granular soils;Hardin;Jour, of SMF Div., Proc. ASCE,1963