1. The Lambda Calculus, Its Syntax and Semantics;Barendregt,1984
2. Combinatory Logic;Curry,1958
3. The conservation theorem revisited;de Groote,1993
4. A simple calculus of exception handling;de Groote,1995
5. Recherches sur la déduction logique (Untersuchungen über das logische schliessen);Gentzen,1955