@inproceedings{HCI-CCAD-1999-ThomaHH,
	author        = "Volker Thoma and Andrea Haf and Arno Hitzges",
	booktitle     = "{Proceedings of the Eighth International Conference on Human-Computer Interaction. Volume 2: Communication, Cooperation, and Application Design}",
	isbn          = "0-8058-3392-7",
	pages         = "1049--1054",
	publisher     = "{Lawrence Erlbaum}",
	title         = "{Usability and navigation in virtual 3D worlds}",
	year          = 1999,
}