1. Abbott, A.R. and Elcock, G. (1987) ‘Pole testing in the European context’, Proceedings of the 6th Symposium on Nondestructive Testing of Wood; 1987 14–16th September, 1987; Washington State University, Pullman, WA, pp. 277–302.
2. AFNOR B 52-001-4 (1991) Règies d'utilisation du bois dans les constructions Partie 4: Classement visuel pour emploi en structure pour les principales essences résineuses et feuillues, Association Française de Normalisation, La Plaine Saint-Denis Cedex, France.
3. ASTM D1990-00 (2002) e1.Standard Practice for Establishing Allowable Properties for Visually-Graded Dimension Lumber from In-Grade Tests of Full-Size Specimens, ASTM International, West Conshohocken, PA, www.astm.org .
4. ASTM D245-06 (2006) Standard Practice for Establishing Structural Grades and Related Allowable Properties for Visually Graded Lumber, ASTM International, West Conshohocken, PA, www.astm.org .
5. ASTM D4442-92 (2003) Standard Test Methods for Direct Moisture Content Measurement of Wood and Wood-Base Materials, ASTM International, West Conshohocken, PA, www.astm.org .