@inproceedings{steinicke2009presenceenhancinggames,
 author = {Steinicke F, Bruder G, Hinrichs K, Steed A},
 title = {Presence-enhancing real walking user interface for first-person video games},
 year = {2009},
 booktitle = {Proceedings of the 2009 ACM SIGGRAPH Symposium on Video Games, Sandbox '09},
}