@inproceedings{CHI-1991-RobertsonMC,
	author        = "George G. Robertson and Jock D. Mackinlay and Stuart K. Card",
	booktitle     = "{Proceedings of the Ninth ACM SIGCHI Conference on Human Factors in Computing Systems}",
	doi           = "10.1145/108844.108883",
	isbn          = "0-89791-383-3",
	pages         = "189--194",
	publisher     = "{ACM}",
	title         = "{Cone Trees: animated 3D visualizations of hierarchical information}",
	year          = 1991,
}