7Lee I D G. Ultrasonic pulse velocity testing considered as a safety measure for timber structures [ C ]//Proceedings of 2nd nondestructive testing of wood symposium, 1965 April, Spokane, WA. Pullman, WA : Washington State University, 1965 : 185 - 203.
8Hoyle R J, Perllerin R F. Stress wave inspection of a wood structure[ C ]//Proceedings of 4th nondestructive testing of wood symposium. Pullman, WA : Washington State University, 1978 : 33 - 45.
9Lanius R M,Tichy R,Bulleit W M. Strength of old wood joists [ C ]//Journal of the Structural Division : Proceedings of American Society of Civil Engineers, 1981,107 (ST12) : 2349 - 2363.
10Ross R J. Quality assessment of the wooden beams and columns of Bay C of the east end of Washington State University football stadium[ R]. Pullman, WA: Washington State University, 1982.
