6. Space Studies Board, National Research Council, The Search for Life's Origins: Progress and Future Directions in Planetary Biology, National Academy Press, Washington, D.C., 1990, p. 47.

7. S.R. Taylor and M.D. Norman, “Accretion of differentiated planetesimals to the Earth,” pp. 29–44 in Origin of the Earth, H.E. Newsom and J.H. Jones, eds., Oxford University Press, New York, 1990.

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