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2. Proceedings of the Fourth International Geotechnical Seminar Singapore Proceedings of the Fourth International Geotechnical Seminar G. Baldi R. Bellotti V. Ghionna M. Jamiolkowski E. Pasqualini Interpretation of CPTs and CPTUs; 2nd part: drained penetration of sands 1986 156
3. 5th International Conference on Geotechnical and Geophysical Site Characterisation (ISC’5) Gold Coast Australia 5th International Conference on Geotechnical and Geophysical Site Characterisation (ISC’5) T. Biryaltseva T. Lunne S. Kreiter T. Mörz R. K. Barry M. Lehane Hugo E. Acosta-Martínez Relative density prediction based on in situ and laboratory measurements of shear wave velocity 2016 389 394
4. Empirical Correlation between SPT N-Value and Relative Density for Sandy Soils
5. Relative density correlations are not reliable criteria;Hamidi B.;Proceedings of the Institution of Civil Engineers: Ground Improvement, ICE Publishing,2013