Owing to the fact that a Living Reviews in Relativity article may evolve over time, we recommend to cite the article as follows:
Jeffrey Winicour,
"Characteristic Evolution and Matching",
Living Rev. Relativity 12, (2009), 3. URL (cited on <date>):
http://www.livingreviews.org/lrr-2009-3
The date given as <date> then uniquely identifies the version of the article you are referring to.
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