@inproceedings{SAC-1994-Takaoka,
	author        = "Tadao Takaoka",
	booktitle     = "{Proceedings of the Ninth Symposium on Applied Computing}",
	doi           = "10.1145/326619.326811",
	pages         = "462--466",
	publisher     = "{ACM}",
	title         = "{Parallel program verification with directed graphs}",
	year          = 1994,
}