@article{VanderLinden:488,
      author        = "Van der Linden, R.A.M. and Berghmans, D. and Vanlommel, P.
                       and Robbrecht, E. and Cugnon, P. and Clette, F. and
                       Wauters, L. and Zhukov, A.N.",
      title         = "{The expanding space weather services of the SIDC at the
                       Royal Observatory of Belgium}",
      year          = "2004",
}