Frans Mäyrä Katri Lietsala Heljä Franssila Artur Lugmayr Proceedings of the 12th international conference on Entertainment and media in the ubiquitous era, Mindtrek 2008, Tampere, Finland, October 7-9, 2008 Mindtrek ACM 2008 db/conf/mindtrek/mindtrek2008.html 978-1-60558-197-2