@article{spiel:pervasive,
	author=		{Petri Lankoski and Satu Heliö and Jani Nummela and Jussi Lahti and Frans Mäyrä and Laura Ermi},
	title=		{A Case Study in Pervasive Game Design: The Songs of North},
	journal=	{Hypermedia Laboratory, University of Tampere},
	year=			{2004}
}