@INPROCEEDINGS{anthes04navigation,
  author = {Christoph Anthes and Paul Heinzlreiter and Gerhard Kurka and Jens
	Volkert},
  title = {Navigation Models for a Flexible, Multi-Mode VR Navigation Framework},
  booktitle = {ACM SIGGRAPH on Virtual Reality Continuum and Its Applications in
	Industry (VRCAI '04)},
  year = {2004},
  pages = {476--479},
  address = {Singapore},
  month = {June},
  publisher = {ACM Press},
  abstract = {Navigation is a key issue for Virtual Reality (VR) applications because
	it forms an integral part of the feeling of presence, which should
	be conveyed by VR applications. This paper presents several VR navigation
	modes which are useful for orientation and interaction in Virtual
	Environments (VEs). Due to the existence of different kinds of applications
	several navigationmodes are required.},
  keywords = {Navigation},
  url = {http://delivery.acm.org/10.1145/1050000/1044693/p476-anthes.pdf?key1=1044693&key2=2674925511&coll=ACM&dl=ACM&CFID=15151515&CFTOKEN=6184618}
}