Footnotes
I. Robinson, J. Robinson andJ. D. Zund:Journ. Math. Mech.,18, 881 (1969).
T. Levi-Civita:Rend. Accad. Lincei,27, 240 (1918).
I. Robinson andA. Trautman:Proc. Roy. Soc., A265, 463 (1962).
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Zund, J.D. Degenerate gravitational fields with twisting rays.—II. Lett. Nuovo Cimento 4, 879–880 (1972). https://doi.org/10.1007/BF02756255
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DOI: https://doi.org/10.1007/BF02756255