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3. EN 338, Structural timber — Strength classes. Brussel: CEN; April 2003
4. Structural fire design according to Eurocode 5 - Design rules and their background;König;Fire Mater,2005
5. EN 1995-1-2 (Eurocode 5), Design of timber structures, Part 1–2 General rules—Structural fire design. Brussel: CEN; 2004