8Gray D H, Sotir R B. Biotechnical and Soil Bioengineering, Slope Stabilization, A Practical Guide for Erosion Control[M]. New York :John Wiley & Son, 1996
9Barker D H. Continuing and future developments in vegetative slope engineering or ecoengineering[A]. In: Proceedings of the International Conference on Vegetation and Slopes[C]. Oxford: [s. n. ], 1994, 29-30
10Nilaweera N S. Effects of tree roots on slope stability: The case of Khao Luang Mountain area, Thailand[PhD Thesis][D]. Bangkok,Thailand: Asian Institute of Technology, 1994