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harvard.edu
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Schon, S.; Head, J.; Fassett, C. (2012). "An overfilled lacustrine system and progradational delta in Jezero crater, Mars: Implications for Noachian climate". Planetary and Space Science. 67 (1): 28–45. Bibcode:2012P&SS...67...28S. doi:10.1016/j.pss.2012.02.003.
macfound.org
"Octavia Butler". MacArthur Foundation Fellows. สืบค้นเมื่อ October 9, 2015.