@ARTICLE{Feulner2013a,
   author = {{Feulner}, G.},
    title = "{On the Relation Between Solar Activity and Clear-Sky Terrestrial Irradiance}",
  journal = {Solar Phys.},
 keywords = {Atmospheric extinction, Integrated Sun observations, Solar cycle, observations, Sunspots, statistics},
     year = 2013,
    month = feb,
   volume = 282,
    pages = {615-627},
      doi = {10.1007/s11207-012-0129-z},
}