Owing to the fact that a Living Reviews in Relativity article may evolve over time, we recommend to cite the article as follows:
Timothy J. Sumner,
"Experimental Searches for Dark Matter",
Living Rev. Relativity 5, (2002), 4. URL (accessed <date>):
http://www.livingreviews.org/lrr-2002-4
The date given as <date> then uniquely identifies the version of the article you are referring to.