[5] ZHANG Ji-xian, ZHANG Yong-hong. ISPRS Journal of Photogrammetry & Remote Sensing, 2007, 62: 461.
[6] Li Jing, Liu Qinhuo, Liu Qiang, et al. Science in China Series E Engineering & Materials Science, 2005, 48: 129.
[7] Zhao Min, Zhou Guangsheng. Forest Ecology and Management, 2005, 207: 295.