@inproceedings{DiGRA-2003-Juul,
	author        = "Jesper Juul",
	booktitle     = "{Proceedings of the Second Digital Games Research Conference: Level Up}",
	ee            = "http://www.digra.org/digital-library/publications/the-game-the-player-the-world-looking-for-a-heart-of-gameness/",
	title         = "{The game, the player, the world: looking for a heart of gameness}",
	year          = 2003,
}