@book{Alan B. Craig_2009, address={Amsterdam}, title={Developing virtual reality applications}, publisher={Morgan Kaufmann/Elsevier}, author={Alan B. Craig}, year={2009} }
@book{Mel Slater_Anthony Steed_Yiorgos Chrysanthou, title={Computer Graphics and Virtual Environments}, publisher={Addison Wesley}, author={Mel Slater and Anthony Steed and Yiorgos Chrysanthou} }
@book{3D user interfaces_2005, address={Boston}, publisher={Addison-Wesley}, year={2005} }