What Makes Online Collectible Card Games Fun to Play?

@Conference{digra403, title ="What Makes Online Collectible Card Games Fun to Play?", year = "2009", author = "Johansson, Stefan J.", publisher = "DiGRA", address = "Tampere", howpublished = "\url{https://dl.digra.org/index.php/dl/article/view/403}", booktitle = "Proceedings of DiGRA 2009 Conference: Breaking New Ground: Innovation in Games, Play, Practice and Theory"}