1. Langseth, M. G., Jr., Keihm, S. J. & Peters, K. Proc. 7th Lunar Sci. Conf. 3143–3171 (1976).
2. Warren, P. H. in Workshop on Pristine Highlands Rocks and the Early History of the Moon (eds Longhi, J. & Ryder, G.)(Lunar and Planetary Institute Technical Rep. 83-02, 75-79, 1983); Geochim. cosmochim. Acta 47, 1559–1571 (1983).
3. Taylor, S. R. Planetary Science: A Lunar Perspective (Lunar and Planetary Institute, Houston, 1982).
4. Morgan, J. W., Hertogen, J. & Anders, E. Moon and Planets 18, 465–478 (1978).
5. Keihm, S. J. & Langseth, M. G. Proc. 8th Lunar Sci. Conf. 499–514 (1977).