HRČKA, Michal, and Ján HEFTY. “Diurnal and Semi-Diurnal Coordinate Variations Observed in European Permanent GPS Network: Deterministic and Stochastic Constituents”. Contributions to Geophysics and Geodesy 36 (May 7, 2021): 7–16. Accessed February 6, 2026. https://journal.geo.sav.sk/cgg/article/view/341.