@book {18413,
	title = {Principles of software engineering and design},
	year = {1979},
	month = {1979///},
	publisher = {Prentice Hall Professional Technical Reference},
	organization = {Prentice Hall Professional Technical Reference},
	isbn = {013710202X},
	author = {Zelkowitz, Marvin V and Shaw,A. C and Gannon,J. D}
}
