1. Aldrin, B., Jones R., Davis H., Talay T.,Thangavelu, M., Repic, E.(2002) Evolutionary Space Transporation Plan for MarsCyclingConcepts, NASA/JPLContract No.1230398
2. To the Editor,
3. Booher,C.(1992) "Man-Systems Integration Standards, NASA-STANDARD-3000."Available at http://standards/msfc.nasa.gov/default.htm.