4557 20200116123103.0 SCART-2020-0017 Bruyninx, C. IAG Travaux 2015-2019, Sub-commission 1.3: Regional References Frames 2019 NO IAG reports 41 2019 21-94 carine.bruyninx@observatoire.be https://iag.dgfi.tum.de/en/iag-publications-position-papers/iag-reports-2019-online/ published in NONREF