Gloria Brown-Simmons Falko Kuester Christopher J. H. Knox So Yamaoka Earth and Planetary System Science Game Engine. 203-218 2009 2 T. Edutainment http://dx.doi.org/10.1007/978-3-642-03270-7_14 journals/tedu/2009-2 db/journals/tedu/tedu2.html#Brown-SimmonsKKY09