@inproceedings{DiGRA-2011-TiemstraBBG,
	author        = "Gordon Tiemstra and Renée van den Berg and Tilde Bekker and Mark de Graaf",
	booktitle     = "{Proceedings of the Sixth DiGRA International Conference: Think, Design, Play}",
	ee            = "http://www.digra.org/digital-library/publications/guidelines-to-design-interactive-open-ended-play-installations-for-children-placed-in-a-free-play-environment/",
	publisher     = "{Digital Games Research Association}",
	title         = "{Guidelines to Design Interactive Open-ended Play Installations for Children Placed in a Free Play Environment}",
	year          = 2011,
}