@article{donahue_green_coverstone_2006, 
  title={Chemical and Solar-Electric-Propulsion Systems Analyses for Mars Sample Return Missions}, 
  volume={43}, 
  DOI={10.2514/1.13958}, 
  publisher={American Institute of Aeronautics and Astronautics (AIAA)}, 
  author={Donahue and Green and Coverstone}, 
  year={2006}
  }