@inproceedings{TOOLS-EUROPE-1999-Henderson-SellersB,
	author        = "Brian Henderson-Sellers and Franck Barbier",
	booktitle     = "{Proceedings of the 29th International Conference on Technology of Object-Oriented Languages and Systems}",
	doi           = "10.1109/TOOLS.1999.779016",
	isbn          = "0-7695-0275-X",
	pages         = "236--250",
	publisher     = "{IEEE Computer Society}",
	title         = "{What is This Thing Called Aggregation?}",
	year          = 1999,
}