Owing to the fact that a Living Reviews in Relativity article may evolve over time, we recommend to cite the article as follows:
Sergey N. Solodukhin,
"Entanglement Entropy of Black Holes",
Living Rev. Relativity 14, (2011), 8. URL (accessed <date>):
The date given as <date> then uniquely identifies the version of the article you are referring to.