Owing to the fact that a Living Reviews in Relativity article may evolve over time, we recommend to cite the article as follows:
Stefan L. Danilishin and Farid Ya. Khalili,
"Quantum Measurement Theory in Gravitational-Wave Detectors",
Living Rev. Relativity 15, (2012), 5. URL (accessed <date>):
The date given as <date> then uniquely identifies the version of the article you are referring to.