Skeivalas, Jonas, Silvija Gečytė, Edita Aleknienė, and Evelina Zigmantienė. 2012. “Analysis of Errors of Geodetic Vertical Network by Different Adjustment Models”. Geodesy and Cartography 33 (2):55-60. https://doi.org/10.3846/13921541.2007.9636718.