1. The behavior of volatiles on the lunar surface
2. 2) Vasavvada, A.R., Murray, B., Wood, S.E. and Paige, A.D.: Long-Term Cryogenic Storage Sites Near the Moon’s Pole, Proc. Inter’l Workshop on Ultra-Long-Term Cryogenic Preservation Network of Biological and Environmental Specimens, Osaka, 1997, p. 80; Kawashima, N.: Environment of the Lunar Polar Ice Region for the Time Capsule Storage, ibid., 1997, pp. 77-79.
3. 3) Lunar Rover to Search for Ice Directly, Lunar Planetary Society Report (1997) (in Japanese).
4. Fluxes of Fast and Epithermal Neutrons from Lunar Prospector: Evidence for Water Ice at the Lunar Poles