Wolfgang Broll Stefan M. Grünvogel Iris Herbst Irma Lindt Martin Maercker Jan Ohlenburg Michael Wittkämper Interactive Props and Choreography Planning with the Mixed Reality Stage. 185-192 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3166&spage=185 2004 conf/iwec/2004 ICEC db/conf/iwec/icec2004.html#BrollGHLMOW04