@inproceedings{TOOLS-PACIFIC-1999-BaekdalK,
	author        = "Lars Kirkegaard Bækdal and Bent Bruun Kristensen",
	booktitle     = "{Proceedings of the 32nd International Conference on Technology of Object-Oriented Languages and Systems}",
	doi           = "10.1109/TOOLS.1999.809421",
	isbn          = "0-7695-0462-0",
	pages         = "139--150",
	publisher     = "{IEEE Computer Society}",
	title         = "{Aggregation from Multiple Perspectives by Roles}",
	year          = 1999,
}