@article{Denkmayr:147,
      author        = "Denkmayr, K. and Cugnon, P.",
      title         = "{About Sunspot Number Medium-Term Predictions}",
      year          = "1997",
      note          = "Solar-Terrestrial Prediction Workshop V, eds G. Heckman et
                       al., Hiraiso Solar Terrestrial Research Center, Japan",
}