9BRIAN M C, IAN A M. A comparison of two input,output approaches for investigating regional economic impacts of the forest products industry in the Pacific Northwest and the South [J]. Forezt Products Journal of Madison, 2001, 51 (6) : 398.
10WHITEMAN A, LEBEDYS A. The contribution of the forestry sector to Mrican economics [ J ]. International Forestry Re- view, 2006, 8 (1): 31-43.
