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2. European Standard EN 1363-1 (1999) Fire resistance tests part 1: general requirements. CEN Central Secretariat, Brussels
3. European Standard EN 1634-1 (2000) Fire resistance tests for doors and shutter assemblies part 1: fire doors and shutters. CEN Central Secretariat, Brussels
4. European Standard EN 13501-2 (2002) Fire classification of construction products and building elements part 2: classification using data from fire resistance tests, excluding ventilation services. CEN Central Secretariat, Brussels
5. Mikkola E (1990) Charring of wood (in Finnish). VTT Research Report 689, Espoo