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Generalization of a Theorem by Goldberg and Sachs
1.J. N. Goldberg and R. K. Sachs, Acta Physica Polonica 22, 13 (1962).
2.E. Newman and R. Penrose, J. Math. Phys. 3, 566 (1962).
3.R. K. Sachs, Proc. Roy. Soc. (London) A264, 309 (1961).
4.F. A. E. Pirani and A. Schild, Bull. Acad. Polon. Sci. Ser. Sci. Math. Astron. Phys. 9, 543 (1961).
5.A short account of our results, without proofs, was given at the International Conference on Relativistic Theories of Gravitation, Warsaw, July 1962, and will appear in the proceedings of the conference.
6.L. P. Eisenhart, Riemannian Geometry (Princeton University Press, Princeton, New Jersey, 1960), Sec. 28.
7.I. Robinson, J. Math. Phys. 2, 290 (1961).
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