1. British Standard Institute BS 1881, Testing concrete Part 204, Recommendations on the use of electromagnetic covermeters, 1988a.
2. British Standard Institute BS 1881, Part 205, Recommendations for radiography of concrete, 1988b.
3. Testing of Concrete in Structures;Bungey,1996
4. A remotely operated building inspection cell;Chamberlain;Autom. Constr.,1992
5. Ground penetrating radar for infrastructure condition assessment and geophysical applications: a review;Halabe,1996