@inproceedings{CHI-1991-LewisKL,
	author        = "J. Bryan Lewis and Lawrence Koved and Daniel T. Ling",
	booktitle     = "{Proceedings of the Ninth ACM SIGCHI Conference on Human Factors in Computing Systems}",
	doi           = "10.1145/108844.108864",
	isbn          = "0-89791-383-3",
	pages         = "131--136",
	publisher     = "{ACM}",
	title         = "{Dialogue structures for virtual worlds}",
	year          = 1991,
}