1. Sand liquefaction in triaxial and simple shear tests;Finn;Proc. ASCE,1971
2. Standard Penetration tests;Fujita;Japanese Society of Soil Mechanics and Foundation Engineering,1966
3. Research on determining the density of sand by spoon penetration test;Gibbs,1957
4. Private communication;Hanzawa,1975
5. Sand liquefaction due to irregular excitation;Ishihara;Soils and Foundations,1972