Citing this Article
 

Owing to the fact that a Living Reviews article may evolve over time, we recommend to cite the article as follows:

Olivier Sarbach and Manuel Tiglio,
"Continuum and Discrete Initial-Boundary Value Problems and Einstein’s Field Equations",
Living Rev. Relativity 15,  (2012),  9. URL (cited on <date>):
http://www.livingreviews.org/lrr-2012-9

The date given as <date> then uniquely identifies the version of the article
you are referring to.