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Mikoláš, M., Žváček, J., Vaněk, M., Donocik, R., Zápalková, P. and Sotorník, V. 2011. Testing the effect of undermining on positional accuracy of the digital technical map of Ostrava in the Přívoz cadastral district. Geodesy and Cartography. 37, 3 (Nov. 2011), 111-118. DOI:https://doi.org/10.3846/13921541.2011.626251.