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3. Moderately Elliptical Very Low Orbits (MEVLOs) as a Long-Term Solution to Orbital Debris, 26th Annual AIAA/USU Conference on SmallSats, SSC12-IV-6;Wertz,2012
4. Impact of propulsion system characteristics on the potential for cost reduction of Earth observation missions at very low altitudes;Bertolucci;Acta Astronaut.,2020
5. Discoverer - radical redesign of Earth observation satellites for sustained operation at significantly lower altitudes;Roberts,2017