6Andrew M Sessler,John M Cornwall,Bob Dietz.Countermeasures-A Technical Evaluation of the Operational Effectiveness of the Planned US National Missile Defense System[EB/OL].http://www.fas.org,2000,4.
8Andrew M Sessler,John M Cornwall,Bob Dietz.Countermeasures-A Technical Evaluation of the Operational Effectiveness of the Planned US National Missile Defense System[EB/OL].http://www.fas.org,2000,4.