8Vanessa T, Heather C, Will M, et al. Drought is normal: the socio-technical evolution of drought and water demand in England and Wales, 1893-2006 [J]. Journal of Historical Geography, 2009, 35(3): 568-591.
9Charalambous C N. Water management under drought conditions [J]. Desalination, 2001, 138(1-3): 3-6.
10Philip Antwi-Agyei,Evan D.G.Fraser,Andrew J.Dougill,et al.Mapping the vulnerability of crop production to drought in Ghana using rainfall,yield and socioeconomic data[J].Applied Geography,2011,(32):324-344.