Owing to the fact that a Living Reviews in Relativity article may evolve over time, we recommend to cite the article as follows:
Andreas Freise and Kenneth A. Strain,
"Interferometer Techniques for Gravitational-Wave Detection",
Living Rev. Relativity 13, (2010), 1. URL (accessed <date>):
The date given as <date> then uniquely identifies the version of the article you are referring to.