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3. Wessel, E. T., “State-of-the-Art of the WOL Specimen for Kic Fracture Toughness Testing,” Westinghouse Scientific Paper 67-1D6-BTLFR-P2 (May 31, 1967).
4. Bush, A. J., “Soldered-Cap Method of Waterproof Protection for Strain Gages,” ISA Paper, Preprint No. 16.11-1-64 (October, 1964).