Laura Recalde Manuel Silva Joaquin Ezpeleta Enrique Teruel Petri Nets and Manufacturing Systems: An Examples-Driven Tour. 742-788 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3098&spage=742 2003 conf/ac/2003pn Lectures on Concurrency and Petri Nets db/conf/ac/acpn2003.html#RecaldeSET03