1. Baldwin, R. B.: 1963,The Measure of the Moon, University of Chicago Press, Chicago.
2. Cameron, W. S.: 1964,J. Geophys. Res. 69, 2423?2430.
3. Cloos, H.: 1928,Zentralbl. Mineral. Geol. Pal. 1928B, 609?621.
4. Colton, G. W., Howard, K. A., and Moore, H. J.: 1972,Apollo 16 Preliminary Science Report, 29:90?93, NASA SP-315.
5. Cruikshank, D. P. and Wood, C. A.: 1972,The Moon 3, 412?447.