1. Wave propagation in elastic solids;Achenbach,1973
2. ACI 228.2R. Nondestructive test methods for evaluation of concrete in structures. Farmington Hills (MI): American Concrete Institute.
3. ASTM C215. Test method for fundamental transverse, longitudinal, and torsional resonant frequencies of concrete specimens. Annual book of ASTM standards, vol. 04.02. West Conshohocken (PA): ASTM.
4. ASTM C1383. Test method for measuring the P-wave speed and the thickness of concrete plates using the impact-echo method. Annual book of ASTM standards, vol. 04.02. West Conshohocken (PA): ASTM.
5. ASTM D 4580. Standard practice for measuring delaminations in concrete bridge decks by sounding. Annual book of ASTM standards, vol. 04.03. West Conshohocken (PA): ASTM.