@article{393978,
      recid = {393978},
      title = {Stepping-stones to the future of space exploration a  workshop report / [electronic resource] :},
      publisher = {National Academies Press,},
      address = {Washington, D.C. :},
      pages = {xi, 63 p. :},
      year = {2004},
      url = {http://library.usi.edu/record/393978},
}