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Michał Kruczyk
Department of Geodesy and Geodetic Astronomy, Faculty of Geodesy and Cartography, Warsaw University of Technology, Pl. Politechniki 1, 00-661,Warsaw, Poland
Tomasz Liwosz
Department of Geodesy and Geodetic Astronomy, Faculty of Geodesy and Cartography, Warsaw University of Technology, Pl. Politechniki 1, 00-661,Warsaw, Poland
Aleksander Pietruczuk
Institute of Geophysics, Polish Academy of Sciences, ul. Księcia Janusza 64, 01-452Warsaw, Poland