International Symposium on Gravity, Geoid and Height Systems 2016 Proceedings Organized by IAG Commission 2 and the International Gravity Field Service, Thessaloniki, Greece, September 19-23, 2016 - Vergos, Georgios S.; Vergos, Georgios S.; Pail, Roland; Pail, Roland; Barzaghi, Riccardo; Barzaghi, Riccardo (Springer International Publishing : Imprint: Springer, 2019)