M. Chein and M. Mugnier, Graph-based Knowledge Representation: Computational Foundations of Conceptual Graphs, 2009.
URL : https://hal.archives-ouvertes.fr/lirmm-00355336

N. Faci, S. Modgil, N. Oren, F. Meneguzzi, S. Miles et al., Towards a Monitoring Framework for Agent-Based Contract Systems, CIA '08: Proceedings of the 12th international workshop on Cooperative Information Agents XII, pp.292-305, 2008.
DOI : 10.1007/978-3-540-85834-8_23

S. Miles, P. Groth, and M. Luck, Handling mitigating circumstances for electronic contracts, AISB 2008 Symposium on Behaviour Regulation in Multi-agent Systems, pp.37-42, 2008.

Y. Shoham and M. Tennenholtz, On social laws for artificial agent societies: off-line design, Artificial Intelligence, vol.73, issue.1-2, pp.231-252, 1995.
DOI : 10.1016/0004-3702(94)00007-N

J. F. Sowa, On conceptual structures, Artificial Intelligence, vol.34, issue.3, 1984.
DOI : 10.1016/0004-3702(88)90069-0