1. Abelson, P.H.: 1966, Proc. Nat. Acad. Sci. U.S.A. 55, p. 1365.
2. Ahrens, T.J. and O’Keefe, J.D.: 1972, The Moon 4, p. 214.
3. Arrhenius, G. de B.R. and Alfven, H.: 1974, in E.D. Goldberg (ed.), The Sea vol. 5, “Marine Chemistry.” Wiley, New York.
4. Bacastow, R.B.: 1976, Nature 261, p. 116.
5. Bada, J.L. and Miller, S.L.: 1968, Science 159, p. 423.