Christiansen, Eric L. (2003), Meteoroid/Debris Shielding(PDF), Washington, DC: National Aeronautics and Space Administration, p. 13, TP−2003-210788, archived from the original(Technical Report) on 2013-02-25.
Christiansen, Eric L. (2003), Meteoroid/Debris Shielding(PDF), Washington, DC: National Aeronautics and Space Administration, p. 13, TP−2003-210788, archived from the original(Technical Report) on 2013-02-25.