Dean Leffingwell, DonWidrig <br/><br/>
Managing software requirements: A unified approach 

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 -  Addison-Wesley Publishing  2000 
 - 491 
<br/><br/>  
<br/><br/><label>ISBN: </label>81-78-08-260-8 
<br/><br/><label>Dewey Class. No.: </label>004.414.3