A. Zakarevičius, S. Šliaupa, E. Paršeliūnas, and A. Stanionis, “Deformation of geodetic network based on GPS data in the Baltic region”, GAC, vol. 34, no. 4, pp. 122–126, Aug. 2012, doi: 10.3846/1392-1541.2008.34.122-126.