@inproceedings{ICEIS-DISI-2009-Chen,
	author        = "Yangjun Chen",
	booktitle     = "{Proceedings of the 11th International Conference on Enterprise Information Systems, Volume 1: DISI}",
	isbn          = "978-989-8111-84-5",
	pages         = "17--24",
	title         = "{Directed Acyclic Graphs and Disjoint Chains}",
	year          = 2009,
}