4899 20200605153111.0 CTALK-2020-0116 Fidalgo, J Definition of a European GNSS Timing Service 2019 2019-09-20 NO Piriz, R Cezón, A Fernández, A Callewaert, K Bolchi, M Defraigne, Pascale Danesi, A Jeannot, M Boyero, JP ION GNSS pascale.defraigne@observatoire.be Contributed CTALKCONT