Anke Eyck Kelvin Geerlings Dina Karimova Bernt Meerbeek Lu Wang Wijnand IJsselsteijn Yvonne de Kort Michiel Roersma Joyce H. D. M. Westerink Effect of a Virtual Coach on Athletes' Motivation. 158-161 2006 conf/persuasive/2006 PERSUASIVE http://dx.doi.org/10.1007/11755494_22 db/conf/persuasive/persuasive2006.html#EyckGKMWIKRW06