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2. Ando K, Ohta M (1999) Variablity of fracture toughness by the crack tip position in an annual ring of coniferous wood. J Wood Sci 45:275–283 doi:10.1007/BF00833491
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4. ASTM standard D143–94 (1994) Standard test methods for small clear specimens of timber. ASTM International, West Conshohocken
5. Björklund L, Walfridsson E (1993) Tallvedens egenskaper i Sverige - Torr-rådensitet, kärnvedhalt, fuktighet och barkhalt. Summary: Properties of Scots pine wood in Sweden - Basic density, heartwood, moisture and bark content. Rapport nr 234, Swedish University of Agricultural Sciences, Department of Forest Products, Uppsala