https://www.veritasradio.com/guests/2015/10oct/VS-151001-cdunn.php
http://planetary.s3.amazonaws.com/sites/hom/docs/The-Planetary-Society---Humans-Orbiting-Mars---A-Critical-Step-Toward-the-Red-Planet.pdf
http://artbell.com/planetary-societys-mars-mission-takes-longer-to-do-less/
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