@inproceedings{ICALP-1978-Valk,
	author        = "Rüdiger Valk",
	booktitle     = "{Proceedings of the Fifth Colloquium on Automata, Languages and Programming}",
	doi           = "10.1007/3-540-08860-1_35",
	isbn          = "3-540-08860-1",
	pages         = "464--476",
	publisher     = "{Springer-Verlag}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{Self-Modifying Nets, a Natural Extension of Petri Nets}",
	volume        = 62,
	year          = 1978,
}