@inproceedings{STOC-1974-Leeuwen,
	author        = "Jan van Leeuwen",
	booktitle     = "{Proceedings of the Sixth Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/800119.803908",
	pages         = "303--309",
	publisher     = "{ACM}",
	title         = "{A Partial Solution to the Reachability-Problem for Vector-Addition Systems}",
	year          = 1974,
}