?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.au=Gaber%2C+Mostafa+Waleed&rft.aufirst=Mostafa+Waleed&rft.aulast=Gaber&rft.degree=Doctoral&rft.tpages=135&rft.inst=UCL+(University+College+London)&rft.title=Approximation+schemes+for+the+scattering+of+spin+one+particles&rft.date=1991