@inproceedings { 212,
	title = {A Natural Extension of Tropos Methodology for Modelling Security.},
	journal = {Workshop on Agent-oriented methodologies, at OOPSLA 2002},
	year = {2002},
	keywords = {pub},
	author = {P. Giorgini and G. Manson and H. Mouratidis and I. Philp}
}