Multiple Smaller Missions as a Direct Pathway to Mars Sample Return
P B Niles,David S Draper, C A Evans,E K Gibson, L D Graham,J H Jones,Susan Lederer, D Ming, Calvin H Seaman,P D Archer,Jeffrey C Andrewshanna,Alice M Baldridge,Mary C Bourke,David A Crown,Marc Douglas Fries, Amy T Knudson,Joseph Ryan Michalski,E Noe Dobrea, D T Vaniman,Catherine M Weitz, R Williams,Bell J F,L P Knauth mag（2012）
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project management,mars exploration
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