?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aufirst=Lawrence+J.&rft.au=Clark%2C+Lawrence+J.&rft.aulast=Clark&rft.degree=Doctoral&rft.inst=University+College+London&rft.tpages=144&rft.title=Studies+on+the+mechanism+of+sodium+transport+at+the+tonoplast+of+Beta+vulgaris.&rft.date=1990