1. Barrett JD, Griffin H (1989) Size effects for Canadian dimension lumber, CIB-W18 Timber Structures, Paper 22-6-1, Berlin, German Democratic Republic, September
2. Barrett JD, Lau W (1989) Moisture content adjustments for in-grade data, CIB-W18 Timber Structures, Paper 22-6-2, Berlin, German Democratic Republic, September
3. Barrett JD, Fewell AR (1990) Size factors for the bending and tension strength of structural timber, CIB-W18 Timber Structures, Paper 23-10-3, Lisbon, Portugal, September
4. Benjamin JR, Cornell AC (1971) Probability statistics and decision for civil engineers. McGraw-Hill
5. Blass HJ, Gard WF (1994) Machine strength grading of timber, Pacific Timber Engineering Conference, vol 2. Gold Coast, Australia, pp 598?603