@article{Pottiaux:3712,
      author        = "Pottiaux, Eric",
      title         = "{ROB's operational European near real-time GNSS-based
                       tropospheric delay models, grids, and maps (from July 2011
                       until 31 Dec 2018)}",
      year          = "2018",
      note          = "The database is continuously and operationally filled.
                       Data retention use a floating windows containing the last 3
                       years of data.",
}