@article{HOEPFNER12_GRL,
   author = "M. H{\"o}pfner and M. Milz and S. A. Buehler and J. Orphal and G. P. Stiller",
   title  = "The natural greenhouse effect of atmospheric oxygen ({O}$_2$) and nitrogen ({N}$_2$)",
   journal= "Geophys. Res. Lett.",
   volume = "39",
   eid    = "L10706",
   doi    = "10.1029/2012GL051409",
   year   = "2012"   }