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

Manuel Güdel,
"The Sun in Time: Activity and Environment",
Living Rev. Solar Phys. 4,  (2007),  3. URL (cited on <date>):
http://www.livingreviews.org/lrsp-2007-3

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

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