中国科学院数学与系统科学研究院期刊网
A KIND OF PETRI NETS INVOLVING TIME FACTORS AND THEIR APPLICATIONS IN ENGINEERING
Wu Zhe-hui, Wang Mei-qin
Acta Mathematicae Applicatae Sinica . 1987, (3): 289 -299 .  DOI: 10.12387/C1987036