Zariņš, A., D. Haritonova, A. Rubans, G. Silabriedis, and J. Zvirgzds. “Field Tests of Astrometric Subsystem”. Geodesy and Cartography, vol. 42, no. 1, Apr. 2016, pp. 1-6, doi:10.3846/20296991.2016.1168029.