1. A gentle introduction to semantic subtyping
2. Type Theory Should Eat Itself
3. Nathaniel Charlton . 2011. Hoare Logic for Higher Order Store Using Simple Semantics . In Logic, Language, Information and Computation, Lev D. Beklemishev and Ruy de Queiroz (Eds.). Springer Berlin Heidelberg , Berlin, Heidelberg . 52–66. isbn:978-3-642- 2092 0-8 Nathaniel Charlton. 2011. Hoare Logic for Higher Order Store Using Simple Semantics. In Logic, Language, Information and Computation, Lev D. Beklemishev and Ruy de Queiroz (Eds.). Springer Berlin Heidelberg, Berlin, Heidelberg. 52–66. isbn:978-3-642-20920-8
4. Edsko de Vries and Vasileios Koutavas . 2011. Reverse Hoare Logic . In Software Engineering and Formal Methods, Gilles Barthe, Alberto Pardo, and Gerardo Schneider (Eds.). Springer Berlin Heidelberg , Berlin, Heidelberg . 155–171. isbn:978-3-642-24690-6 Edsko de Vries and Vasileios Koutavas. 2011. Reverse Hoare Logic. In Software Engineering and Formal Methods, Gilles Barthe, Alberto Pardo, and Gerardo Schneider (Eds.). Springer Berlin Heidelberg, Berlin, Heidelberg. 155–171. isbn:978-3-642-24690-6