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Branislav Droščák
Geodetic controls analysis section, Department of Geodetic Controls, Geodetic and Cartographic Institute Bratislava, Chlumeckého 4, 827 45 Bratislava, Slovakia
Karol Smolík
Geodetic controls analysis section, Department of Geodetic Controls, Geodetic and Cartographic Institute Bratislava, Chlumeckého 4, 827 45 Bratislava, Slovakia