Mel Slater Antonio Frisoli Franco Tecchia Christoph Guger Beau Lotto Anthony Steed Gert Pfurtscheller Robert Leeb Miriam Reiner Maria V. Sanchez-Vives Paul F. M. J. Verschure Ulysses Bernardet Understanding and Realizing Presence in the Presenccia Project. 90-93 2007 27 IEEE Computer Graphics and Applications 4 http://doi.ieeecomputersociety.org/10.1109/MCG.2007.93 db/journals/cga/cga27.html#SlaterFTGLSPLRSVB07