@article{Lefèvre:4175,
      author        = "Lefèvre, Laure and Clette, Frédéric and Delouille,
                       Véronique and Mathieu, Sophie and von Sachs, Rainer",
      title         = "{The Sunspot Number Recalibration}",
      month         = "Oct",
      year          = "2018",
}