23. P.H. Schultz, M.I. Staid, and C.M. Pieters. 2006. Lunar activity from recent gas release. Nature 444:184-186.

24. M.C. Liang and Y.L. Yung. 2009. Modeling the distribution of H2O and HDO in the upper atmosphere of Venus. Journal of Geophysical Research 114:E00B28, doi:10.1029/2008JE003095.

25. F. Taylor and D. Grinspoon. 2009. Climate evolution of Venus. Journal of Geophysical Research 114:E00B40, doi:10.1029/2008JE003316.

26. See, for example, National Research Council, Strategy for Exploration of the Inner Planets 1977-1987, National Academy of Sciences, Washington, D.C., 1978.

27. National Research Council. 2003. New Frontiers in the Solar System: An Integrated Exploration Strategy. The National Academies Press, Washington, D.C.

28. National Research Council. 2008. Opening New Frontiers in Space: Choices for the Next New Frontiers Announcement of Opportunity. The National Academies Press, Washington, D.C.

29. See, for example, M.A. Bullock, D. Senske, and the VFDRM team, Venus flagship design reference mission (VFDRM), 2009, available at http://vfm.jpl.nasa.gov/.

30. National Research Council. 2008. Opening New Frontiers in Space: Choices for the Next New Frontiers Announcement of Opportunity. The National Academies Press, Washington, D.C.

31. S.S. Limaye and VEXAG Committee. 2009. Pathways for Venus Exploration, Venus Exploration Analysis Group (VEXAG). Available at http://www.lpi.usra.edu/vexag/reports/pathways1009.pdf.

32. M.A. Bullock, D. Senske, and the VFDRM team. 2009. Venus Flagship Design Reference Mission (VFDRM). Available at http://vfm.jpl.nasa.gov/.

33. National Research Council. 2007. Scientific Context for Exploration of the Moon. The National Academies Press, Washington, D.C.

34. NASA Advisory Council. 2007. Workshop in Enabling Science in the Lunar Architecture. Tempe, Ariz. Available at http://www.lpi.usra.edu/meetings/LEA/.

35. National Research Council. 2008. Opening New Frontiers in Space: Choices for the Next New Frontiers Announcement of Opportunity. The National Academies Press, Washington, D.C.



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