@article{Lefèvre:4325,
      author        = "Lefèvre, Laure and Clette, Frederic",
      title         = "{IAGA Resolution: International Sunspot Number: support to
                       WDC SILSO}",
      month         = "Jul",
      year          = "2019",
      note          = "A IAGA resolution for the WDC-SILSO was voted after this
                       presentation. ",
}