1. Tronci E. (1991a) Equational programming in λ-calculus. Proc. LICS 91, Amsterdam July 15–18,IEEE Computer Society, pp. 191–202.
2. Tronci E. (1991b) Equational programming in λ-calculus via SL-systems. PhD thesis, Department of Mathematics, Carnegie Mellon University.
3. Leivant D. (1981) Reasoning about functional programs and complexity classes associated with type disciplines. 24th Ann. Symp. on Foundation of Computer Science, pp. 460–469.
4. On sets of solutions to combinator equations