1. Testing Concrete, Recommendations tor the measurement of dynamic modulus of elasticity;British Standard;BS1881,1990
2. Testing Concrete, Recommendations for the measurement of velocity of ultrasonic pulses in concrete;British Standard;BS1881,1986
3. Non-destructive evaluation of concrete bridge decks using flexural waves;Kayser,1995
4. Rayleigh wave stone block and surface flaw detection;Danilov;Russ. J. NDT,1994