1. [AHJ+OO]_A. Franke A, S.M. Hess, G.Ch. Jung, M. Kohlhase, and V. Sorge. Agent-oriented integration of distributed mathematical services. Journal of Universal Computer Science, 5, 2000.
2. Henk Barendregt. The quest for correctness. Images of SMC research, pages 39–58, 1996. At
ftp://ftp.cs.kun.nl/pub/CompMath.Found/quest.ps.Z
.
3. [BBC+97]_Bruno Barras, Samuel Boutin, Cristina Cornes, Jean-Christophe Filliatre, Eduardo Giménez, Hugo Herbelin, Gerard Huet, Cesar Muñoz, Chetan Murthy, Catherine Parent, Christine Paulin-Mohring, Amokrane Saibi, and Benjamin Werner. The Coq Proof Assistant Reference Manual: Version 6.1. Technical Report RT-0203, Inria, May 1997.
4. Robert S. Boyer and Gilles Dowek. Towards checking proof-checkers. In Workshop on Types for Proofs and Programs (Type’ 93), 1993.
5. Lect Notes Comput Sci;R. Boulton,1998