Yuichi Fujiki Konstantinos Kazakos Colin Puri Ioannis Pavlidis Justin Starren James Levine NEAT-o-games: ubiquitous activity-based gaming. 2369-2374 2007 conf/chi/2007a CHI Extended Abstracts http://doi.acm.org/10.1145/1240866.1241009 db/conf/chi/chi2007a.html#FujikiKPPSL07