?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aulast=Goldsmith&rft.aufirst=Benjamin+John&rft.au=Goldsmith%2C+Benjamin+John&rft.title=A+diatom-based+model+to+monitor+trophic+status+in+lowland+rivers+using+artificial+substrata&rft.date=2002&rft.degree=Doctoral&rft.tpages=356&rft.inst=UCL+(University+College+London)