HL-20 Personnel Launch System: differenze tra le versioni

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*{{cita web|titolo=Aerodynamic Characteristics of HL-20|id={{citeseerx|10.1.1.34.8652}}}}
*{{cita web|url=http://www.ninfinger.org/models/vault2008/HL-20/HL-20%20MODEL.pdf|titolo=Improving the Subsonic Performance of Proposed Personnel Launch System Concept}}
*{{cita web|url=httphttps://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19910010752_1991010752.pdf|titolo=Design and Fabricatio of the NASA HL-20 Support Cradle and Interior Mockup|editore=NASA}}
*{{cita web|url=httphttps://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19940030181_1994030181.pdf|titolo=Launch-Pad Abort Capabilities of the HL-20 Lifting Body|editore=NASA}}
*{{cita web|url=httphttps://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19910006695_1991006695.pdf|titolo=Design and Fabrication of the NASA HL-20 Full Scale Research Model|editore=NASA}}
 
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