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* Nacke, L. (2009). From Playability to a Hierarchical Game Usability Model. In Proceedings of the 2009 Conference on Future Play on @ GDC Canada (Vancouver, British Columbia, Canada, May 12-13, 2009). FuturePlay '09. ACM, New York, NY, 11-12. doi:10.1145/1639601.1639609
* Nacke, L. E., Drachen, A., Kuikkaniemi, K., Niesenhaus, J., Korhonen, H. J., Hoogen, W. M. v. d., et al. (2009). . Proceedings of DiGRA 2009: Breaking New Ground: Innovation in Games, Play, Practice and Theory,

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