Efficient algorithm for computing minimum trap (siphon) set in large scale Petri net models
LIAO Jing-jing，WANG Ming-zhe，NI Feng，GUO Fa-bin
Journal of Systems Engineering and Electronics . 2010, (8): 1766 -1770 .  DOI: 10.3969/j.issn.1001-506X.2010.08.45