Citing this Article
 

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

J. Fernando Barbero G. and Eduardo J. S. Villaseñor ,
"Quantization of Midisuperspace Models",
Living Rev. Relativity 13,  (2010),  6. URL (cited on <date>):
http://www.livingreviews.org/lrr-2010-6

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