1. Andrews MK (2002) Which acoustic speed? Proceedings of the 13th International Symposium on Nondestructive Testing of Wood, Beall FC (ed.), Forest Products Society, Madison, pp 159–65
2. Bucur V (1995) Acoustics of wood. CRC Press Inc, New York
3. Sandoz J-L (1993) Moisture content and temperature effect on ultrasound timber grading. Wood Sci Technol 27:373–80