1. American Society for Testing and Materials (ASTM). (
1980). “Standard practice for dealing with outlying observations.” ASTM E178-80 Committee E 11 Philadelphia.
2. American Society for Testing and Materials (ASTM). (
1983). “Standard practice for examination and sampling of hardened concrete in constructions.” ASTM C83 Committee C 8 Philadelphia.
3. American Society for Testing and Materials (ASTM). (
1990). “Standard test method for obtaining and testing drilled cores and sawed beams of concrete.” ASTM C42-90 Committee C 9 Philadelphia.
4. Variation of in-place concrete strength in structures;Bartlett F. M.;ACI Mater. J.,1999
5. Testing and evaluation of concrete strength in structures;Sullivan P. J. E.;ACI Mater. J.,1991