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Alcubierre, M., Hyperbolic slicings of spacetime: singularity avoidance and gauge shocks, Classical and Quantum Gravity, 2003, (20): 607–623, Bibcode:2003CQGra..20..607A, arXiv:gr-qc/0210050
Stephani, H.; Kramer, D.; MacCallum, M.; Hoenselaers, C.; Herlt, E., Sec. 1.1 What are exact solutions, and why study them?, Exact Solutions of Einstein's Field Equations, Cambridge Monographs on Mathematical Physics, Cambridge University Press, 2003 [2018-03-14], ISBN 9781139435024, (原始内容存档于2016-05-29)