1. EN 384:2004-01. Structural timber – Determination of characteristic values of mechanical properties and density. CEN Euopean Committee for Standardization
2. EN 338:2003-04. Structural timber – Strength classes. CEN Euopean Committee for Standardization
3. DIN 1052:2004-08. Design of timber structures – General rules and rules for buildings. DIN German Institute for Standardization. (only available in German)
4. EN 408:2003-08. Timber structures – Structural timber and glued laminated timber – Determination of some physical and mechanical properties. CEN Euopean Committee for Standardization
5. Benham CA, Canisius TDG, Morrison PAG (1997) Compression, tension and shear strength properties for CEN strength classes based on UK grown timber using new CEN methods. Centre for Timber Technology & Construction, BRE CR 24/97. Watford, United Kingdom