Ki Yung Ahn, Tim Sheard. Shared subtypes: subtyping recursive parametrized algebraic data types. In Andy Gill, editor, Proceedings of the 1st ACM SIGPLAN Symposium on Haskell, Haskell 2008, Victoria, BC, Canada, 25 September 2008. pages 75-86, ACM, 2008. [doi]
Abstract is missing.