Philip Buchanan Hartmut Seichter Mark Billinghurst Raphael Grasset Augmented reality and rigid body simulation for edutainment: the interesting mechanism - an AR puzzle to teach Newton physics. 17-20 2008 Advances in Computer Entertainment Technology http://doi.acm.org/10.1145/1501750.1501754 conf/ACMace/2008 db/conf/ACMace/ace2008.html#BuchananSBG08