DIAS-STP-01-08 Duality and Non-linear Response for Quantum Hall Systems. Brian Dolan and Cliff Burgess This preprint is available for download : Portable Document Format (Size: 200K) Postscript (Size: 1.5M) To obtain copies of any of the preprints in the archives, please contact us and specify the preprint number(s), author(s), title(s) and number of copies wanted.