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A class of gauges for the Einstein vacuum equations is introduced, along with three symmetric hyperbolic systems.
Newman, E. and Penrose, R., J. Math. Phys
1962
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Friedrich, H., Proc. R. Soc. Lond. A
1981
Cited alongside, same era.
Reiterer, M. and Trubowitz, E., arxiv.org/abs/0910.4666, v1
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Taylor, M. E.,
1997
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