@inproceedings{SIGMOD-1991-RichardsonS,
	author        = "Joel E. Richardson and Peter M. Schwarz",
	booktitle     = "{Proceedings of the 21st ACM SIGMOD International Conference on Management of Data}",
	cdrom         = "SIGMOD91/P298.PDF",
	doi           = "10.1145/115790.115839",
	pages         = "298--307",
	title         = "{Aspects: Extending Objects to Support Multiple, Independent Roles}",
	year          = 1991,
}