Reference
Berman, S. M. (1988).Gen. Rel. Grav.,20, 841.
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Bondi, H. Note on a paper by Berman. Gen Relat Gravit 21, 747–751 (1989). https://doi.org/10.1007/BF00759084
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DOI: https://doi.org/10.1007/BF00759084