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Buttsworth, David R. (2010) Ludwieg tunnel facility with free piston compression heating for supersonic and hypersonic testing. In: 9th Australian Space Science Conference, 28-30 Sept 2009, Sydney, Australia.
Jokic, Michael D. and Longuski, James M. (2004) Design of tether sling for human transportation systems between Earth and Mars. Journal of Spacecraft and Rockets, 41 (6). 1010-1015 . ISSN 0022-4650