@inproceedings{ICSE-1989-NakagawaF,
	author        = "Ataru T. Nakagawa and Kokichi Futatsugi",
	booktitle     = "{Proceedings of the 11th International Conference on Software Engineering}",
	doi           = "10.1145/74587.74611",
	editor        = "Larry E. Druffel and Dick Fairley and Dines Bjørner",
	isbn          = "0-8186-1941-4",
	pages         = "166--177",
	publisher     = "{IEEE Computer Society / ACM Press}",
	title         = "{Stepwise Refinement Process with Modularity: An Algebraic Approach}",
	year          = 1989,
}