1. Recommendations for testing concrete by hardness methods, Tentative recommendation, 7-NDT committee – nondestructive testing;RILEM NDT-7;Mater. Struct.,1977
2. Pessiki SP (chair). In-place methods to estimate concrete strengths. ACI 228.1R-03 report; 2003.
3. IAEA International Atomic Energy Agency. Guidebook on non-destructive testing of concrete structures. Testing Training Course Series No. 17; 2002.
4. Criteria for identifying concrete homogeneous areas for the estimation of in-situ strength in RC buildings;Masi;Constr. Build. Mater.,2016
5. Assessment of in situ compressive strength in structures and precast concrete;EN 13791,2007