@conference {34,
	title = {Roles in Collaborative Activity},
	booktitle = {Second Hellenic Conference on Artificial Intelligence, SETN 02},
	volume = {2308},
	year = {2002},
	month = {00/2002},
	pages = {449 - 460},
	publisher = {LNCS - Springer Verlag},
	organization = {LNCS - Springer Verlag},
	address = {Thessaloniki, Greece},
	author = {I. Partsakoulakis and G. Vouros},
	editor = {I. Partsakoulakis}
}
