Heesun Kim An MPEG-4 Authoring System with Temporal Constraints for Interactive Scene. 457-465 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3333&spage=457 2004 conf/pcm/2004-3 PCM (3) db/conf/pcm/pcm2004-3.html#Kim04a