1. Kubojima Y, Okano T, Ohta M (1998) Vibrational properties of sitka spruce heat treated in nitrogen gas. J Wood Sci 44:73–77
2. Clark GL, Howsmon JA (1946) Swollen, impregnated, and compressed wood samples. Ind Eng Chem 38:1257–1262
3. Hushitani M (1968) Effect of heat-treatment on static viscoelasticity of wood (in Japanese). Mokuzai Gakkaishi 14:208–213
4. Kitahara K, Chuganji M (1951) Effects of heat treatment on the mechanical properties of wood (in Japanese). J Jpn For Soc 33:414–419
5. Sato K, Yamamoto H, Kitani Y (1995) Influence of heat-treatment on fracture toughness and mechanical properties of wood (in Japanese). Bull Fac Educ Mie Univ 46:109–112