TU Vienna Virtual Environments Group.
The page gives an overview of current and ongoing research on virtual environments at the TU Vienna. Projects focus on real-time graphics, user interfaces and multi-user systems.
www.cg.tuwien.ac.at/research/vr/   reviews

Virtual Reality Centre at Teesside Ltd
vr.tees.ac.uk/   reviews

Spatial Culling of Interpersonal Communication within Large-Scale Multi-User Virtual Environments.
A book by Aaron K. Pulkka.
www.hitl.washington.edu/publications/pulkka/   reviews