@inproceedings{ECOOP-1994-WieringaJS,
	author        = "Roel Wieringa and Wiebren de Jonge and Paul Spruit",
	booktitle     = "{Proceedings of the Eighth European Conference on Object-Oriented Programming}",
	doi           = "10.1007/BFb0052175",
	editor        = "Mario Tokoro and Remo Pareschi",
	isbn          = "3-540-58202-9",
	pages         = "32--59",
	publisher     = "{Springer-Verlag}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{Roles and Dynamic Subclasses: A Modal Logic Approach}",
	volume        = 821,
	year          = 1994,
}