Owing to the fact that a Living Reviews in Solar Physics article may evolve over time, we recommend to cite the article as follows:
Dana W. Longcope,
"Topological Methods for the Analysis of Solar Magnetic Fields",
Living Rev. Solar Phys. 2, (2005), 7. URL (accessed <date>):
The date given as <date> then uniquely identifies the version of the article you are referring to.