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@Article{Christensen:2005:PSM, author = "Philip R. Christensen", title = "Planetary Science: The Many Faces of {Mars}", journal = j-SCI-AMER, volume = "293", number = "1", pages = "32--39", month = jul, year = "2005", CODEN = "SCAMAC", DOI = "https://doi.org/10.1038/scientificamerican0705-32", ISSN = "0036-8733 (print), 1946-7087 (electronic)", ISSN-L = "0036-8733", bibdate = "Fri May 17 10:28:26 MDT 2013", bibsource = "http://www.math.utah.edu/pub/tex/bib/sciam2000.bib", URL = "http://www.nature.com/scientificamerican/journal/v293/n1/full/scientificamerican0705-32.html; http://www.nature.com/scientificamerican/journal/v293/n1/pdf/scientificamerican0705-32.pdf", acknowledgement = ack-nhfb, fjournal = "Scientific American", journal-URL = "http://www.nature.com/scientificamerican", }