@article{Lefèvre:4324,
      author        = "Lefèvre, Laure and Mathieu, Sophie and Clette, Frederic",
      title         = "{The Sunspot Number series: reconciling past and present
                       with modern tools}",
      month         = "Jul",
      year          = "2019",
      note          = "Session: Old Data for New Knowledge: Preservation and
                       Utilization of Historical Data in the Geosciences",
}