@conference {16770,
	title = {Systematic Derivation of Software Requirements},
	booktitle = {Proceedings of the 1st International Conference on the Entity-Relationship Approach to Systems Analysis and Design},
	year = {1980},
	month = {1980///},
	pages = {403 - 404},
	author = {Yeh,R. Y and Roussopoulos, Nick and Chang,P.}
}
