1. Bezzazi, E-H, Revision and Update based on Stratified Forward Chaining in Frontiers in Belief Revision, edited by Mary-Anne Williams and Hans Rott, 2001 Kluwer Academic Publishers. (2001) 315-332
2. Bezzazi, E-H, Specific Stratified Forward Chaining, Proceedings of the International Conference on Artificial Intelligence, Las Vegas, Nevada, USA, (2000) 1455-1460
3. Bezzazi, E-H, Workflows et Systèmes experts dans l’administration électronique, Communication au Colloque International Administration électonique et qualité des préstations administratives, Lille, France, 11/19/2004
4. The official site of PHP: http://www.php.net
5. Horty, J., Thomason, R., Touretzky, D., A skeptical theory of inheri-tancein nonmonotonic networks, Artificial Intelligence, (1990) 311-348