?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.au=Keijzer%2C+Coen&rft.aulast=Keijzer&rft.aufirst=Coen&rft.degree=Bachelor&rft.title=Urban+ecological+principles+as+a+driver+of+sustainable+urban+development+-+An+assessment+of+four+European+forerunners&rft.tpages=183&rft.date=2021