[31] V. Balovnev, New methods for calculating resistance to cutting of soil, Amerind Publishing, New Dehli, India, 1983. [32] G. Heiken, D. Vaniman, and B. French, eds. Lunar sourcebook, Cambridge University Press, Cambridge, U.K, 1991. [33] K. Skonieczn,, et al, lightweight robotic excavation for the moon and “Productive Mars,” Journal of Aerospace Engineering, Vol. 27, doi:10.1061/(ASCE)AS.1943-5525.0000342, 2014. [34] H. Nakashima, Y. Shioji, K. Tateyama, et. al., cutting resistance of lunar “Specific regolith simulant under low J. Space Eng., 1(1), 58-68, 2008. gravity conditions.” [34] P. Spudis, B. Bussey, J. Plescia, et. al., "Geology of Shackleton Crater and the south pole of the Moon", 2008. [36] 2016. [Online]. Available at: Budget Estimates, “Fiscal Year 2016,” https://www.nasa.gov/sites/default/files/files/nasa_fy2016_summary_brief_corrected.pdf. [Accessed: 28-Feb-2016]. [37] S. Creech, J. Halloday, and D. Dual Use Upper Stage (DUUS) Jones, “SLS Opportunities.” [38] 551 [Online]. Available at: Rockets. “Atlas V – Rockets,” http://spaceflight101.com/spacerockets/atlas-v-551/. [Accessed: 28-Feb-2016].
[31] V. Balovnev, New methods for calculating resistance to cutting of soil, Amerind Publishing, New Dehli, India, 1983. [32] G. Heiken, D. Vaniman, and B. French, eds. Lunar sourcebook, Cambridge University Press, Cambridge, U.K, 1991. [33] K. Skonieczn,, et al, “Productive lightweight robotic excavation for the moon and Mars,” Journal of Aerospace Engineering, Vol. 27, doi:10.1061/(ASCE)AS.1943-5525.0000342, 2014. [34] H. Nakashima, Y. Shioji, K. Tateyama, et. al., “Specific cutting resistance of lunar regolith simulant under low gravity conditions.” J. Space Eng., 1(1), 58-68, 2008. [34] P. Spudis, B. Bussey, J. Plescia, et. al., "Geology of Shackleton Crater and the south pole of the Moon", 2008. [36] “Fiscal Year 2016,” Budget Estimates, 2016. [Online]. Available at: https://www.nasa.gov/sites/default/files/files/nasa_fy2016_summary_brief_corrected.pdf. [Accessed: 28-Feb-2016]. [37] S. Creech, J. Halloday, and D. Jones, “SLS Dual Use Upper Stage (DUUS) Opportunities.” [38] “Atlas V 551 – Rockets,” Rockets. [Online]. Available at: http://spaceflight101.com/spacerockets/atlas-v-551/. [Accessed: 28-Feb-2016].