1. ISO 179 (1993): Plastics — Determination of Charpy Impact Strength.
2. DIN 51 222 (1985): Werkstoffprüfinaschinen, Pendelschlagwerke.
3. ASTM E 399 (1990): Standard Test Method for Plan-Strain Fracture Toughness of Metallic Materials.
4. Sumpter J.D.G., Turner C.E. (1976): Cracks and Fracture. ASTM STP 601: 3–18
5. Merkle J.G., Corten H.T. (1974): Journal of Pressure Vessel Technology 96, 4: 286ff