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2. Decision support in space situational awareness;Abbot;Linc. Lab. J.,2007
3. The space situational awareness program of the European Space Agency;Bobrinsky;Cosmic Res.,2010
4. National Security Space Strategy Unclassified Summary;Gates,2011
5. Continuing Kepler's Quest: Assessing Air Force Space Command's Astrodynamics Standards;National Research Council,2012