?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aulast=Jones&rft.aufirst=Geraint+Owain&rft.au=Jones%2C+Geraint+Owain&rft.inst=UCL+(University+College+London)&rft.tpages=178&rft.degree=Doctoral&rft.date=1991&rft.title=Positron+impact+ionization+processes+in+gases