Adapting a regional geoid model to national geodetic infrastructure and conventions [Online resource]Oja, Tõnis; Märdla, Silja; Ellmann, Artu; Rüdja, Andres1st Joint Commission 2 and IGFS Meeting International Symposium on Gravity, Geoid and Height Systems 2016 : September 19-23, 2016, Thessaloniki, Greece : program2016 / [2] p http://gghs2016.com/search/?entry=958