1. Turner, G., Cadogan, P. H. & Yonge, C. J. Proc. Lunar Sci. Conf. 4, 1889–1914 (1973).
2. Tera, F., Papanastassiou, D. A. & Wasserburg, G. J. Abstr. Lunar Planet. Sci. Conf. 4, 723–725 (1973).
3. Cohen, B. A., Swindle, T. D. & Kring, D. A. Science 290, 1754–1756 (2000).
4. Gomes, R., Levison, H. F., Tsiganis, K. & Morbidelli, A. Nature 435, 466–469 (2005).
5. Spudis, P. et al. J. Geophys. Res. Planets 116, E00H03 (2011).