@ARTICLE{2012RvGeo..50G2006F,
   author = {{Feulner}, G.},
    title = "{The faint young Sun problem}",
  journal = {Rev.\ Geophys.},
     year = 2012,
    month = may,
   volume = 50,
      eid = {RG2006},
    pages = {RG2006},
      doi = {10.1029/2011RG000375}
}