S-C. Mu and R. S. Bird, Theory and applications of inverting functions as folds. In Science of Computer Programming Vol. 51 Special Issue for Mathematics of Program Construction 2002, pp. 87-116, 2003. [PDF][GZipped Postscript]
S-C. Mu and R. S. Bird, Rebuilding a tree from its traversals: a case study of program inversion. In The First Asian Symposium on Programming Languages and Systems, LNCS 2895, pp. 265-282, Bejing, 2003. [GZipped Postscript]
R. S. Bird, J. Gibbons and S-C. Mu, Algebraic methods for optimisation problems. In Algebraic and Coalgebraic Methods in the Mathematics of Program Construction, LNCS 2297, pp. 281-307, January 2002. [PDF]
R. S. Bird and S-C. Mu, Inverting the Burrows-Wheeler Transform. In ACM SIGPLAN 2001 Haskell Workshop, Firenze, Italy, September 2001. Superseded by the extended version for Journal of Functional Programming.