HEFTY, Ján, and Miroslava IGONDOVÁ. 2010. “Diurnal and Semi-Diurnal Coordinate Variations Observed in EUREF Permanent GPS Network – a Case Study for Period from 2004.0 to 2006.9”. Contributions to Geophysics and Geodesy 40 (3), 225-47. https://doi.org/10.2478/v10126-010-0010-8.