@inproceedings{CHI-1991-WhittakerBC,
	author        = "Steve Whittaker and Susan E. Brennan and Herbert H. Clark",
	booktitle     = "{Proceedings of the Ninth ACM SIGCHI Conference on Human Factors in Computing Systems}",
	doi           = "10.1145/108844.108944",
	isbn          = "0-89791-383-3",
	pages         = "361--367",
	publisher     = "{ACM}",
	title         = "{Co-ordinating activity: an analysis of interaction in computer-supported co-operative work}",
	year          = 1991,
}