Leo Ojala Olli-Matti Penttinen Elina Parviainen Modeling and Analysis of Margolus Quantum Cellular Automata Using Net-Theoretical Methods. 331-350 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3099&spage=331 2004 conf/apn/2004 ICATPN db/conf/apn/icatpn2004.html#OjalaPP04