Sources: Secret carbon fiber bombs kill power in SerbiaCNN Military Affairs Correspondent Jamie McIntyre May 3, 1999http://www.cnn.com/US/9905/03/secret.weapon/ Yugoslavia Unplugged By William M. ArkinSpecial to washingtonpost.com Monday, May 10, 1999http://www.washingtonpost.com/wp-srv/national/dotmil/arkin051099.htm