1. BS 6089, ‘Guide to the assessment of concrete strength in existing structures’ (British Standard Institution, London, 1981).
2. A.C.I. Committee 228, ‘In place methods for determination of strength of concrete’,A.C.I. Materials Journal 85 (5) (1988) 446–471.
3. Neville, A.M., ‘Properties of Concrete’ 4rd edn. (Longman, Harlow, Essex, 1995), 581–648.
4. Carino, N.J., ‘Statistical methods to evaluate in-place test results’, Presented at the Fall Convention of A.C.I., Robert E. Philleo Symposium on Concrete Technology, Dallas, Texas, November 14, 1991.
5. Hindo, K.R. and Bergstrom, W.R., ‘Statistical evaluation of the in-place strength of concrete’,Concrete International 7 (2) (1985) 44–48.