1. Aarts, C., Backhouse, R., Hoogendijk, P., Voermans, E., van der Woude, J.: A relational theory of datatypes (December 1992), available from: www.cs.nott.ac.uk/~rcb/papers
2. Backhouse, K., Backhouse, R.C.: Safety of abstract interpretations for free, via logical relations and Galois connections. Sci. of Comp. Programming 15(1–2), 153–196 (2004)
3. Backhouse, R.C.: Mathematics of Program Construction. Univ. of Nottingham, Draft of book in preparation, 608 pages (2004)
4. Barbosa, L.S., Oliveira, J.N.: Transposing partial components — an exercise on coalgebraic refinement. Technical report, DI/UM (September 2005) (submited)
5. Bird, R., de Moor, O.: Algebra of Programming. In: Hoare, C.A.R. (ed.) Series in Computer Science. Prentice-Hall Int., Englewood Cliffs (1997)