If only there were some sort of site where people saved such links and tagged them for others to find
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Sorry that it's far from recent (1996), but if you're not familiar with it, The Case For Mars by Richard Wagner and Robert Zubrin is a thorough study on efficiently getting to and exploring Mars with a lot of background and justification. I think it holds up.
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For papers from NASA, on this or any other subject, always check NTRS first.https://www.sti.nasa.gov/
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