?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.au=Westra%2C+J.&rft.aufirst=J.&rft.aulast=Westra&rft.degree=Master&rft.date=2017&rft.title=What+Strategy+is+needed+to+secure+the+freshwater+supply+for+future+generations+in+Friesland%3F