1973, Jones, MH , - Crack Toughness Evaluation of Hot Pressed and Forged Beryllium
16. Family of crack-tip fields characterized by a triaxiality parameter—II. Fracture applications
1972 R.H. Heyer and D.E. Mccabe - Plane-stress Fracture Toughness Testing Using a Crack-line-loaded Specimen
1975,Orange, TW - Fracture Testing With Surface Crack Specimens
