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2. U. Schneider and U. Diederichs, Betonwerk & Fertigteil Technik
4 (1981) 223.
3. Comitè Euro-International du Bèton, Bulletin d'Information no. 145, Janvier (1982).
4. ANSI/ASTM, Standard Test Method for Plane-Strain Fracture Toughness of Metallic Materials, E 399-78 (1978).
5. ASTM Special technical publication;W. F. Brown Jr,1967