V. Devedžić and D. Gašević, "Software Support for Teaching Petri Nets: P3," Advanced Learning Technologies, IEEE International Conference on(ICALT), Athens, Greece, 2003, pp. 300.
doi:10.1109/ICALT.2003.1215093
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url:doi.ieeecomputersociety.org/10.1109/ICALT.2003.1215093