Eckhard Freund Michael Schluse Object oriented discrete event based simulation and control of complex 3D systems. 863-868 2004 RAM http://ieeexplore.ieee.org/xpls/abs_all.jsp?isnumber=30961&arnumber=1438031&count=104&index=43 conf/ram/2004 db/conf/ram/ram2004.html#FreundS04