7Kraaij T,Milton S J.Vegetation Changes(1995-2004)in semi-arid Karoo Shrubland,South Africa:Effects of Rainfall,Wild Herbivores and Changes in Land Use[J].Journal of Arid Environments,2006,64:174-192.
8Cannon S H,1988.Regional rainfall-threshold conditions for abundant debris-flow activity[C]//In:Ellen S D.Wieezorek G F,1988.Landslides,floods and Marine Effects of the Storm of3-5 January.1982 in the San Francisco Bay Region,California.[S.l.]:[s.n.].1988.
9Stuckmann P,Muller F.GPRS radio network capacity and quality of service using fixed and on-demand channel allocation techniques[C]//in:Vehicular Technology Conference Proceedings,2000.VTC 2000一Spring Tokyo.2000 IEEE 51 st.Tokyo:[s.n.].2000.
