William Steptoe Robin Wolff Alessio Murgia Estefania Guimaraes John Rae Paul M. Sharkey David J. Roberts Anthony Steed Eye-tracking for avatar eye-gaze and interactional analysis in immersive collaborative virtual environments. 197-200 2008 CSCW http://doi.acm.org/10.1145/1460563.1460593 conf/cscw/2008 db/conf/cscw/cscw2008.html#SteptoeWMGRSRS08