6Jayne B. A. 1959. Vibrational properties of wood as indices of qual- ity I J 1. Forest Products Journal,2009 ( 11 ) :413 - 416.
7Wang X. Stress wave-based nondestructive evaluation(NDE) meth- ods wood quality of standing trees [ D ]. Houghton: Michigan Technological University, 1999.
8Wu S. Wave propagation behavior in lumber and the application of stress wave techniques in standing tree quality assessment [ D ]. Moscow: University of Idaho, 2002.
9Pilon C. Effectiveness of nondestructive evaluation technique for assessment standing timber quality [ M ]. Houghton : Michigan Tech- nological University,2005.
10Wang X, Carter P, Ross R J. Acoustic assessment of wood quality of raw forest materials-A path to increased profitability [ J ]. Forest Product Journal,2007,57 (5) : 6 - 14.