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2. BS 1881: Part 207-1992. Testing concrete. Recommendations for the assessment of concrete strength by near-to-surface tests. British Standard Institution, 2 Park Street, W1A 2BS London, UK.
3. DIN ISO 8046:1982. Deutsche Norm: Festbeton-Bestimmung der Ausziehfestigkeit.
4. DS. 423.31. Danish Standard: Betonprovning, haerdnet beton, udtraeksprovning. Dansk standard, 12 Aurehojvej, DK-2900 Hellerup, Denmark; 1984.
5. ISO/DIS 8046. Concrete hardened—determination of pullout strength. International Organization for Standardization. 1 Rue de Varembe, Case Postal 56; 1982.