1. Vesic, Aleksandar S., "Design of pile foundations" NCHRP synthesis of highway practice, 42 (1977).## 2. O'Neil MW, Reese L. C., "Drilled shafts: Construction procedures and design methods", No. FHWA-IF-99-025 (1999). ## 3. Kulhawy, Fred H., Christina Stas Jackson, "Some observations on undrained side resistance of drilled shafts", In Foundation Engineering: Current principles and practices, (1989) 1011-1025. ASCE,. ## 4. Meyerhof G. G., "Bearing capacity and settlemtn of pile foundations", Journal of Geotechnical and Geoenvironmental Engineering 102: (1976) 197-228. ## 5. Aoki N., Velloso D. D., "An approximate method to estimate the bearing capacity of piles", InProc., 5th Pan-American Conf, of Soil Mechanics and Foundation Engineering (1975). ## 6. Philipponnat G., "Méthode pratique de calcul d'un pieu isolé, à l'aide du pénétromètre statique", Revue Francaise de Geotechnique, (10) (1980) 55-64. ## 7. Bustamante M., Frank R., "Design of axially loaded piles in France: National Report", In International Seminar Design of Axially loaded piles: European Practice, (1997) 161-175. ## 8. Bustamante M., Gianeselli L., "Pile bearing capacity prediction by means of static penetrometer CPT", In Proceedings of the 2-nd European symposium on penetration testing, (1982) 493-500. ## 9. Itasca F. L. A. C., "Fast Lagrangian analysis of continua", Itasca Consulting Group Inc., Minneapolis, Minn (2000). ## 10. Bowles L. E., "Foundation analysis and design", 5th edition. McGraw-hill (1996). ## 11. Horikoshi K., Randolph M. F., "Centrifuge modelling of piled raft foundations on clay. Geotechnique", 46(4) (1996) 741-752. ## 12. Horikoshi K., Randolph M. F., "A contribution to optimum design of piled rafts". Geotechnique, 48 (3) (1998) 301-317. ## 13. Fleming K., Weltman A., Randolph M., Elson K., "Piling engineering", 3rd edition. CRC press (2008). ## 14. Whitaker T, Cooke R. W., "An investigation of the shaft and base resistance of large bored piles in London clay", London: Institution of Civil Engineers (1966). ## 15. Reese L. C., Wright S. J., "Construction procedures and design for axial loading", Drilled Shaft Manual HDV-22 (1977). ## 16. Mayne Paul W., Kemper J. B., "Profiling OCR in stiff clays by CPT and SPT", Geotechnical testing journal 11, No. 2, (1988)139-147. ## 17. Anagnostopoulos A., Koukis G., Sabatakakis N., Tsiambaos G., "Empirical correlations of soil parameters based on cone penetration tests (CPT) for Greek soils", Geotechnical & Geological Engineering 21, No. 4, (2003) 377-387. ##