1. Ray Methods for Waves in Elastic Solids;Achenbach,1982
2. British Standards, No.4408, Part 5, Recommendation for Nondestructive Methods of Pulse in Concrete (British Standard Institute, London, 1974)
3. American Society for Testing Materials, Designation C597–83, Standard Test Method for Pulse Velocity through Concrete (Annual Book of ASTM Standards, 1985)
4. Nondestructive Testing of Concrete;Jones,1962
5. State-of-the-Art on Nondestructive Testing of Concrete;Akashi;Concrete Journal,1985