@article{Pottiaux:3710,
      author        = "Pottiaux, Eric",
      title         = "{ROB's operational final GNSS-based tropospheric delay
                       models, grids, and maps (from July 2011 until 31 Dec
                       2018)}",
      year          = "2018",
      note          = "The database is continuously and operationally. Data
                       retention use a floating windows containing the last 4
                       years of data.",
}