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2. Control of strong motion by the upper 30meters;Anderson;Bull. Seismol. Soc. Am.,1996
3. Multivariate interpolation to incorporate thematic surface data using inverse distance weighting (IDW);Bartier;Comput. Geosci.,1996
4. Regional correlations of VS30 and velocities averaged over depths less than and greater than 30meters;Boore;Bull. Seismol. Soc. Am.,2011
5. Eurocode 8: Design of Structures for Earthquake Resistance–Part 5: Foundations, Retaining Structures and Geotechnical Aspects;British Standard Institution (BSI),2003