References containing SWE-991 - Not used in any SWE

These SWEREFs, have SWE-991 in the Affiliated SWE field. They are available for reuse. They are not used in any SWE or Topic. 

Reference ID \ (click to edit)	Link	Title	Citation	Notes	Affiliated SWE
SWEREF-206	https://www.amazon.com/Customer-Centered-Products-Successful-Requirements/dp/0814405681 ...	Customer-Centered Products: Creating Successful Products through Smart Requirements Management,	Hooks, Ivy F., Farry, Kirstin A., American Management Association, New York, 2001. Formerly used in SWE-055.		SWE-991,
SWEREF-247	http://searchsoftwarequality.techtarget.com/news/1275907/The-importance-of-testing-software-requirem ...	The importance of testing software requirements	Marasco, Dr. Joe, 2007.	In http://www.techtarget.com. Requires Free Membership to view content. Formerly in SWE-055.	SWE-991,
SWEREF-322	http://www.cs.nott.ac.uk/~cah/G51ISS/Documents/NoSilverBullet.html ...	No Silver Bullet: Essence and Accidents of Software Engineering,	Brooks, Frederick P., Computer, Vol. 20, No. 4 (April 1987) pp. 10-19. Formerly in SWE-055.		SWE-991,
SWEREF-388	...				SWE-991,
SWEREF-459	...				SWE-991,
SWEREF-471	...				SWE-991
SWEREF-564	...				SWE-991,
SWEREF-663	...				SWE-991,
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