Amtoft, Torben, Flemming Nielson, Hanne Riis Nielson, and Jürgen Ammann. “Polymorphic Subtyping for Effect Analysis: The Semantics”. DAIMI Report Series 25, no. 502 (April 1, 1996). Accessed May 9, 2024. https://tidsskrift.dk/daimipb/article/view/7031.