1. American Concrete Institute Report ACI 228.2R-98. Non-destructive test methods for evaluation of concrete in structures. Farmington Hills, MI: ACI. p. 62.
2. From theory to field experience with the non-destructive vibration testing of piles;Davis;Proc Inst Civil Engnrs, Part 2,1974
3. NDE using impulse radar to evaluate material properties in concrete structures;Lim,2001
4. Impact-Echo: non-destructive evaluation of concrete and masonry;Sansalone,1997