• Symposium of the IAG Reference Frame Sub-Commission for Europe (EUREF) in Tallinn, May 22-24, 2019Kollo, Karin; Ellmann, Artu; Poutanen, MarkkuIAG Newsletter2019 / p. 6-7 : phot https://iag-aig.org/doc/5d29c4313d37a.pdf