1. Amir, J. M. (2002). “Single-tube ultrasonic testing of pile integrity.” Deep Foundations Congress 2002 — International Perspective on Theory, Design, Construction, and Performance, Orlando, FL, United states, pp. 836–850.
2. Baker Jr, C. N., Drumright, E. E., Mensah, F., Parikh, G., and Ealy, C. (1991a). “Dynamic testing to predict static performance of drilled shafts: Results of FHWA research.” Proceedings of the Geotechnical Engineering Congress, Boulder, Colorado, USA, Vol. 1, pp. 491–504.
3. Baker Jr, C. N., Drumright, E. E., Mensah, F., Parikh, G., and Ealy, C. (1991b). “Use of nondestructive testing to evaluate defects in drilled shafts.” Transportation Research Record, Vol. 1331, pp. 28–35.
4. Baldi, G. (1989). “Modulus of sands from CPT’s and DMT’s.” Proceedings of the 12th International Conference on Soil Mechanics and Foundation Engineering, Rio de Janeiro, Br, Vol. 1, pp. 165–170.
5. Briaud, J. L., Ballouz, M., and Nasr, G. (2002). “Defect and length predictions by NDT methods for nine bored piles.” International Perspective on Theory, Design, Construction, and Performance, Orlando, FL, United states, pp. 173–192.