1. Northrop, D.A., Worpinski, N.R., Schmidt, R.A. and Smith, C.W., “Stimulation and Mineback Experiment Project—The Direct Observation of Hydraulic and Explosive Fracturing Tests,” Proc. of the Fourth Annual DOE Symposium on Enhanced Oil and Gas Recovery and Improved Drilling Methods, August 1978, Tulsa, Oklahoma (published by the Oil and Gas Journal, P.O. Box 1260, Tulsa, OK 74101).
2. American Society for Testing and Materials, “Standard Test Method for Plane-Strain Fracture Toughness of Metallic Materials,” (ANSI/ASTM E-399-74), Annual Book of Standards, Part 10, 505–524 (1977).
3. Schmidt, R.A., “Fracture Toughness Testing of Limestone,”Experimental Mechanics,16 (5),161–167 (May 1976).
4. Schmidt, R.A., “Fracture Mechanics of Oil Shale—Unconfined Fracture Toughness, Stress Corrosion Cracking and Tension Test Results,” Proc. of the 18th U.S. Symposium on Rock Mechanics, Keystone, CO, 2A2-1 to 2A2-6 (June 1977).
5. Schmidt, R.A. and Lutz, T.J., “K 1c and J 1c of Westerly Granite—Effects of Thickness and In-Plane Dimensions,” Presented at the Virginia Polytechnic Institute and State University for the 11th National Symposium on Fracture Mechanics, Blacksburg, Virginia, June 12–14, 1978. (To appear in a forthcoming ASTM STP.).