author        = "García-Rigo, A. and Roma-Dollase, D. and
                       Hernández-Pajares, M. and Li, Z. and Wang, N. and
                       Terkildsen, M. and Olivares, G. and Ghoddousi-Fard, R. and
                       Erdogan, E. and Dettmering, D. and Haralambous, H. and
                       Béniguel, Y. and Berdermann, J. and Kriegel, M. and
                       Krypiak-Gregorczyk, A. and Gulyaeva, T. and Komjathy, A.
                       and Vergados, P. and Feltens, J. and Zandbergen, R. and
                       Fuller-Rowell, T. and Altadill, D. and Blanch, E. and
                       Bergeot, N. and Chevalier, J.-M. and Krankowski, A. and
                       Agrotis, L. and Galkin, I. and Orus-Perez, R.",
      title         = "{Assessment of global and regional VTEC ionospheric maps
                       within IAG’s RTIM-WG}",
      month         = "Apr",
      year          = "2018",