Calow, R.C.

Morris, B.L. et al., 2003. Groundwater and its susceptibility to degradation : a global assessment of the problem and options for management, (Early warning and assessment report series / UNEP-DEWA no. RS.03-3) Nairobi, Kenya: UNEP, United Nations Environment Programme. Available at: https://fr.ircwash.org/sites/default/files/BGS-2003-Groundwater.pdf.