@article{Pireaux:352,
      author        = "Pireaux, S. and Defraigne, P. and Wauters, L. and Bergeot,
                       N. and Baire, Q. and Bruyninx, C.",
      title         = "{Higher-order ionospheric effects in GPS time and
                       frequency transfer }",
      year          = "2010",
}