Mala Mehrotra Sergio Alvarado Ross Wainwright Laying a Foundation for Software Engineering of Knowledge Bases in Spacecraft Ground Systems. 73-77 1999 conf/flairs/1999 FLAIRS Conference db/conf/flairs/flairs1999.html#MehrotraAW99 http://www.aaai.org/Library/FLAIRS/1999/flairs99-013.php