@INPROCEEDINGS{fibrations,
	AUTHOR = "E. W. Stark",
	TITLE = "Dataflow Networks are Fibrations",
	BOOKTITLE = "Proc.~Summer Conference on Category Theory and
			Computer Science",
	PUBLISHER = "Springer-Verlag",
	SERIES = "Lecture Notes in Computer Science",
	YEAR = "1991",
	MONTH = SEP,
	VOLUME = 530,
	PAGES = "261--281"
}