1. Ågren, J. and R. Svensson. 2007. “Postglacial land uplift model and system definition for the new Swedish height system RH 2000.” LMV-Rapport 4.
2. Brockmann, E. 2009. “Monitoring of official national ETRF coordinates on EPN web.” Project of the EUREF TWG. http://www.epncb.oma.be/_productsservices/coordinates/pdf/ETRF_Monitoring_Firenze_Brockmann.pdf.
3. Dach, R, S. Lutz, P. Walser, and P. Fridez. 2015. Bernese GNSS Software Version 5.2. Astronomical Institute, University of Bern, Switzerland.
4. Ellmann, A., S. Märdla, and T. Oja. 2020. “The 5 mm geoid model for Estonia computed by the least squares modified Stokes’s formula.” Survey Review 52(373), 352–72. 10.1080/00396265.2019.1583848.
5. ELB. 2022. GeoRefAct. Interreg Estonian-Latvian V-A project “Harmonization of Estonian and Latvian geodetic systems in border areas.” https://geoportaal.maaamet.ee/est/Ruumiandmed/Geodeetilised-andmed/Eesti-geodeetiline-susteem/GeoRefAct-p885.html.