Zariņš, A., Haritonova, D., Rubans, A., Silabriedis, G. and Zvirgzds, J. 2016. Field tests of astrometric subsystem. Geodesy and Cartography. 42, 1 (Apr. 2016), 1-6. DOI:https://doi.org/10.3846/20296991.2016.1168029.