https://www.space.com/38177-northrop-grumman-acquires-orbital-atk.html
https://www.bizjournals.com/washington/news/2017/09/19/northrop-orbital-deal-hailed-by-analysts-as-a-race.html
https://washingtontechnology.com/articles/2017/09/19/northrop-services-orbital.aspx
https://www.usatoday.com/story/money/2017/09/18/northrop-grumman-orbital-atk-acquisition/676197001/
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