HSU-CHUN YEN2020-06-162020-06-162002https://scholars.lib.ntu.edu.tw/handle/123456789/502476Sequential versus concurrent languages of labeled conflict-free Petri netsjournal article10.1109/TAC.2002.8006642-s2.0-0036647206https://www.scopus.com/inward/record.uri?eid=2-s2.0-0036647206&doi=10.1109%2fTAC.2002.800664&partnerID=40&md5=81b31f278b8148198f381215cd89685a