?url_ver=Z39.88-2004&rft_id=PQ+ETD%3A593181&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.au=Sofroniou%2C+A&rft.aufirst=A&rft.aulast=Sofroniou&rft.tpages=400&rft.title=The+parametrically+excited+pendulum+system+and+applications+to+ship+dynamics&rft.inst=UCL+(University+College+London)&rft.degree=Doctoral&rft.date=31+November+2006