@misc {IOPORT.70450749,
    author       = {He, Jianbin and Su, Qunxing and Liu, Pengyuan},
    title        = {Modeling and analysis of equipment virtual maintenance process based on extended Petri net},
    howpublished = {IFITA (3), 181-184 (2009).},
    year         = {2009},
    identifier   = {70450749},
}