1. Devold AMT. Langevåg, Norway. Product data sheet; 1995.
2. DIAB. Laholm, Sweden. Technical manual H-grade; 1995.
3. Nordtest, Espoo, Finland, Sandwich panels: local impact strength of frp-sandwich panels; 1998.
4. GOM Home page; 2003.
5. Fracture of composites;Argon,1972