Georg Neis, Derek Dreyer, Andreas Rossberg. Non-parametric parametricity. In Graham Hutton, Andrew P. Tolmach, editors, Proceeding of the 14th ACM SIGPLAN international conference on Functional programming, ICFP 2009, Edinburgh, Scotland, UK, August 31 - September 2, 2009. pages 135-148, ACM, 2009. [doi]
Abstract is missing.