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2. Fiscal Year 2021 Department of Defense Space University Research Initiative 2021.https://www.grants.gov/web/grants/view-opportunity.html?oppId=332151 FOA–AFRL–AFOSR-2021-0004.
3. S.Hildreth A.Arnold Technical report Libray of Congress Washington DC Congressional Rsearch Service 2014.
4. Controlling the growth of future LEO debris populations with active debris removal