BibTex format
@article{Solanki:2013:10.1002/asna.201211752,
author = {Solanki, SK and Unruh, YC},
doi = {10.1002/asna.201211752},
journal = {ASTRONOMISCHE NACHRICHTEN},
pages = {145--150},
title = {Solar irradiance variability},
url = {http://dx.doi.org/10.1002/asna.201211752},
volume = {334},
year = {2013}
}