@inproceedings{ author={Bj\&\#246rk Staffan and Holopainen Jussi}, year={2003}, title={Describing Games: An Interaction-Centric Structural Framework}, isbn={ISSN 2342-9666}, booktitle={DiGRA \&\#3903 - Proceedings of the 2003 DiGRA International Conference: Level Up}, url={http://www.digra.org/wp-content/uploads/digital-library/05150.10348.pdf} }