1. A general Church-Rosser theorem;Aczel,1978
2. Paths in the λ-calculus;Asperti,1994
3. Interaction systems I: the theory of optimal reductions;Asperti,1992
4. Optimal reductions in interaction systems;Asperti,1993
5. Paths, computations and labels in the λ-calculus;Asperti,1993